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The sacrum is the portion of the vertebral column between the lumbar vertebrae and the structures of the coccyx. It is composed of five vertebrae which are fused together to form a single bone structure. The sacrum features a median crest which is made of the fused spinous processes of its component vertebrae. Beneath this crest is the sacral canal, a tunnel which runs lengthwise from the top of the sacrum to a hiatus (opening) near the bottom. Four pairs of sacral foramina pierce the sacrum, flanking the medial line, where the intermediate sacral crests are formed by the fused articular processes of the component vertebrae. To the outside of the intermediate sacral crests are the lateral crests, formed by the fused transverse processes of the component vertebrae. In the sacrum, therefore, unlike the upper vertebrae in the spine, the intertransverse ligaments have been replaced by fusion of these processes together. The crests are not represented on the pelvic surface of the sacrum, though the sacral foramina are evident.
 Research Sacrum
The veins in the brain return blood from the dura mater and partially from the bones. They terminate in various sinuses, among which are the inferior sagittal sinus, the superior sagital sinus, and the straight sinus. The sagital sinuses are situated near the parietal bone.
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The sagittal suture runs longitudinally along the crest of the head from the frontal bone to the occipital. This suture joins the two parietal bones in the middle of the cranial vault. The sagittal suture intersects the coronal suture perpendicularly, and the lambdoid suture in a tripartite manner.
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Sal prunella was a medicine comprised of potassium nitrate and sodium carbonate formerly used as a remedy for sore throats.
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Salbutan is a brand name for albuterol.
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Salbutol is a brand name for albuterol.
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Salbuven is a brand name for albuterol.
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Salbuvent is a brand name for albuterol.
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Saliva is a secretion from the salivary glands in the mouth. When food is smelled or tasted, or often even thought of, the salivary glands begin their secretion to prepare the mouth for the food. Mumps, an inflammatory glandular infection, affects the salivary glands, resulting in difficulty chewing and swallowing.
Saliva also performs a cleaning function, serving to keep exfoliated epithelial cells, most bacteria, and food particles away from the teeth.
Saliva keeps the mouth lubricated for articulation and speech and also helps to moisten food to assist in swallowing. Enzymes in saliva begin digestive breakdown of the food even before it reaches the stomach. A number of toxins (including lead, mercury, and other heavy metals) are secreted in the saliva and the body's water balance regulation is also assisted by salivary secretion.
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Salmaplon is a brand name for albuterol.
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Salol (phenyl salicylate) is a colourless crystalline substance obtained by the action of phenol on salicylic acid and employed in medicine externally as an antiseptic and internally as a mouth wash and as an intestinal and urinary disinfectant.
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Salomol is a brand name for albuterol.
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The salpingopharyngeus originates from the cartilage portion of the Eustatian tube and inserts into the muscular layer of the pharynx. This small muscle lifts the pharynx and helps open the eustachian tube during swallowing. The lower end of the eustachian tube opens during swallowing to allow air to flow into the middle ear and equalize the air pressure on both sides of the tympanic membrane. The salpingopharyngeus is innervated by the pharyngeal plexus of nerves.
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Saltermox is a brand name for Amoxicillin.
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Samhainophobia is the fear of Halloween.
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Samosillin is a brand name for Amoxicillin.
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Samthongcillin is a brand name for Amoxicillin.
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The saphenous veins are located in the leg. The short saphenous vein begins at the outer arch on the top of the foot and ascend along the Achilles tendon to the popliteal vein. It receives many venous branches from the back of the leg and the top of the foot. The long saphenous vein, or great saphenous vein, begins along the inner arch on the top of the foot and ascends along the inner side of the leg up through the thigh to the femoral vein. Both veins have numerous valves to assist in the transportation of blood. There are more valves located in the thigh. In bypass surgery, the saphenous vein is cut from the leg and used as a graft.
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Sarmassophobia is the fear of love play.
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Sarsaparilla is a drug prepared from the dried roots of several plants of the genus Smilax, which grows in Mexico, Central and South America. Today the term is also a slang expression for Jamaican Cannabis.
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The sartorius (tailor's muscle) is the body's longest muscle. It is a long, narrow, ribbon-like muscle that spirals down the thigh. It begins on the front of the hip, where it originates at the front point of the pelvis (the tip of the anterior superior iliac spine), runs down and across the front of the thigh, and along the inner side of the knee where it inserts in the upper end (tuberosity) of the tibia. It is innervated by the femoral nerve and supplied by the femoral artery. This muscle is a powerful flexor of the thigh. It helps bend both hip and knee and twist the leg allowing you to sit cross-legged.
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Satanophobia is the fear of Satan.
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Sawacillin is a brand name for Amoxicillin.
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Sawamezin is a brand name for Amoxicillin.
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Scabies is a skin disease due to an animal parasite, the Sarcoptes scabei, which burrows beneath the skin, most commonly at the clefts of the fingers.
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Scabiophobia is the fear of scabies.
Research Scabiophobia
The scalene muscles (the scalenus posticus, the scalenus medius, scalenus minimus, and the scalenus anticus) work together to aid in breathing. During inhalation, they lift the first and second rib. They also bend the spinal column to one side or the other. The scalenus posticus is the smallest of the three muscles, originating from the lower two or three cervical (neck) vertebrae and descends to insert into the second rib. The scalenus medius is the largest and longest of the three muscles. It originates from the lower six cervical vertebrae and is inserted into the first rib. The scalenus anticus lies deep at the side of the neck, behind the sternomastoid. It originates from the third, fourth, fifth, and sixth cervical vertebrae and descends to the first rib. It also separates the subclavien artery and vein. The three scalene muscles are innervated by the cervical plexus and supplied by the cervical artery. The scalenus minimus is the smallest of the scalene muscles. It lies between the scalenus anticus and the scalenus medius, originating from the cervical vertebrae and descending to the first rib. This muscle is sometimes referred to as Sibson's muscle after the British anatomist Francis Sibson. It may also be referred to as Albinus' muscle after the German anatomist and surgeon Bernhard S. Albinus.
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The scaphoid bone is one of the bones in the human wrist.
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In human anatomy, the scapula or shoulder blade, lies upon the upper part of the back, forming the shoulder. It has a shallow cavity (glenoid cavity), into which is inserted the head of the humerus. Several strong ligaments and muscles are attached to the elevations of this bone, which keep it in place and move it about as required.
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Scarlet Fever (Scarlatina) is an infectious fever, characterised by a sore throat, a red, diffuse eruption on the skin, followed by shedding of the superficial part of the skin. Inflammation of the ears and kidneys are common complications.
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Scelerophibia is the fear of bad men, burglars.
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Schafer's method is the simplest method of artificial respiration. It can be performed without assistance and encourages the removal of fluid from the air passages by gravity. The patient is placed on his face with his shoulders raised a little so that the mouth is unobstructed. Pressure is exerted on the patient's loins and lower ribs, thus compressing the abdominal contents and forcing the diaphragm upwards. As the weight is taken off the patient's loins, the abdomen and thorax re-expands and inspiration occurs.
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Schistosomiasis (bilharziasis) is a disease caused by infestation of the body with blood flukes of the genus Schistosoma.
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Schlionophobia is the fear of school.
Research Schlionophobia
The Schwanns cells, or neurilemma, are layers of cells which cover the myelin sheath segments of some nerve cells. Schwanns cells cover each axon segment of the nerve cells, and constrict at the nodes of Ranvier. The neurons of the brain and spinal cord do not have such a cell layer covering their myelin sheaths.
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The sciatic nerves branch off of the spinal cord between the fourth lumbar and third sacral vertebrae. They extend down the legs, innervating the hamstrings, and branch into the tibial and peroneal nerves which innervate the lower leg.
Research Sciatic Nerves
Sciatica (neuritis of the leg) is a pain of the sciatic nerves, often caused by exposure to cold or wet.
Research Sciatica
Sciophobia is the fear of shadows.
Research Sciophobia
The sclera can be seen as the opaque white of the eye. It is composed of tough, white fibrous tissue and encases the eyeball. The sclera contains fine blood vessels. When the eye is irritated by dust or disease, the blood vessels become enlarged and the 'white' of the eye appears pink or bloodshot.
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Scleroderma is a chronic progressive disease most common among women, characterised by a local or diffuse thickening and hardening of the skin.
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Sclerous tissue provides the stiffening which is essential for the formation of the general framework of the body. There are two varieties of sclerous tissue: cartilage and bone.
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Scoleciphobia is the fear of worms.
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Scolionophobia is the fear of school.
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Scoliosis is an abnormal lateral curvature of the spine, of congenital origin or caused by trauma or disease of the vertebrae or hipbones.
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Scopophobia is the fear of being stared at.
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Scotomaphobia is the fear of blindness in visual field.
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In psychiatry, scotomization is a defence mechanism in which a person develops selective blind-spots to certain kinds of emotional or anxiety-producing situations or conflicts.
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Scotophobia is the fear of the dark, it is also called nyctophobia.
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Scotophobin is a substance alleged to be the biochemical basis of scotophobia.
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Scriptophobia is the fear of writing in public.
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Scrofula was a former term for tuberculosis, especially of the lymphatic glands and bones.
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The scrotum is the protective skin pouch which contains the testes (testicles). It is located in the groin, on the outside of the abdominal cavity. This positioning allows the testicles to remain at a temperature slightly below body temperature, a critical condition in the development of viable spermatozoa. After puberty, the hair begins to grow on the scrotum and nearby skin. This pubic hair remains for the rest of the adult life.
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Scrub typhus is an acute febrile disease characterised by severe headache, skin rash, chills, and swelling of the lymph nodes, caused by the bite of mites infected with the microorganism Rickettsia tsutsugamushi. Scrub typhus occurs mainly in Asia, Australia, and the islands of the western Pacific.
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Scurvy (scorbutus) is a disease caused by a deficiency of vitamin C. It is characterised by anaemia, great weakness, spongy and swollen gums, and haemorrhages. In recent times scurvy was thought to be caused by a lack of fresh animal and vegetable food. Scurvy was very common in ships and in armies. Lime juice was the first effective preventative agent introduced into the navy in the early 19th century and made compulsory in the British mercantile marine in 1867.
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The sebaceous glands lie just below the skin adjacent to the hair follicles and connected by a short duct. They secretes sebum into the hair follicles, providing a lubricant for the hair and skin. Sebum is a semifluid substance composed of waxes, fatty acids, cholesterol, and debris from skin cells. By coating the hair and the dead keratin cells of the stratum corneum, sebum sequesters moisture, keeping hair glossy and skin pliable. Sebum is important for many other reasons. It contains a precursor to vitamin D that produces the mature vitamin when struck by the ultraviolet rays of the sun. It also kills certain forms of harmful bacteria.
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Sebar is a tarde name for secobarbital.
Research Sebar
Seborrhoea is a condition of the skin in which there is excessive secretion by the sebaceous glands, forming crusts with scales from the skin and dirt.
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Secobarbital is a drug very similar to phenobarbital used to relieve anxiety, insomnia and as a pre- anaesthetic agent.
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Seconal is a tarde name for secobarbital.
Research Seconal
Secretin is a hormone produced by the small intestine in vertebrates that stimulates the production of digestive secretions.
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Selachophobia is the fear of sharks.
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Selaphobia is the fear of light flashes.
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Selenophobia is the fear of the moon.
Research Selenophobia
The sella turcia or pituitary fossa, is a deep depression on the surface of the body of the sphenoid bone, where the pituitary body sits. It is named the sella turcica after its shape which is similar to a turkish saddle. This depression contains a number of foramina, or small openings, through which a number of small vessels bring nutrients to the pituitary gland.
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The semicircular canals comprise the organ of balance occupying mush of the inner ear, next to the cochlea. The three semicircular canals are set at right angles to one another: one parallel to the ground, a second parallel to the side of the head, and a third parallel to the front of the head or face. The canals are responsible for sensing the movements of the head in three dimensions. Each fluid-filled canal contains sensory hairs connected to receptor cells that provide information to the cerebellum. As the head is tilted, the fluid presses on the sensory hairs of the receptor cells. The receptor cells convert the pressure into electrical signals which are sent to the brain via nerve impulses. Other receptor cells are situated in and near the semicircular canals. The nerve impulses are essential to the control of balance.
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The semimembranosus muscle is one of the hamstring muscles. It flexes the lower leg at the knee joint and rotates it in. It consists of a fleshy muscle belly with a tendon at each end. The muscle fibres originate from the tuberosity of the ischium and extend downward from the knee to insert in the middle of the outer condyle of the femur (upper leg bone) and the medial condyle of the tibia (lower leg bone). It is innervated by the tibial nerve and supplied by the profunda femoris. The tendon of the semimembranosus muscle, along with the semitendinosus and gracilis, form the inner hamstring.
Research Semimembranosus Muscle
The seminal vesicles are responsible for secreting a fluid component of semen as the sperm cells pass through the vas deferens. The two vesicles resemble small, bulbous pouches and are located just above the prostate gland.
Research Seminal Vesicles
The semispinalis capitis (complexus) is a deep muscle on the back of the neck that lies below the trapezius. It originates from the spine (7th cervical down to the 6th or 7th thoracic vertebrae) and inserts into the elongated area at the base of the skull (occipital bone). It is innervated by dorsal branches of the cervical nerve and is supplied by muscular branches of the aorta. Both the trapezius and the semispinalis capitis create the muscular column on the back of the neck. The semispinalis capitis muscle extends the head and rotates it so the face is directed to the opposite side.
Research Semispinalis Capitis
The semispinalis cervicis (semispinalis colli) stretch along and surround the vertebrae of the spine. These muscle run continuous with the semispinalis thoracis muscles. The semispinalis cervicis muscles originate from the transverse processes of the second to fifth thoracic vertebrae and insert into the spinous process of the axis and third, fourth, and fifth cervical vertebrae. The semispinalis muscles give the spine its flexibility to bend, as when taking a deep bow. The semispinalis cervices muscles, specifically, extend the cervical spine. These muscles are innervated by dorsal branches of the cervical and thoracic nerves and are supplied by muscular branches of the aorta.
Research Semispinalis Cervicis
The semispinalis thoracis consists of long straps of muscle that stretch along and surround the vertebrae of the spine. The muscle can have between four and eight upper ends, which originate from the transverse processes of the fifth to eleventh thoracic vertebrae in the upper chest. These straps of muscle insert in the spinous processes of the first four thoracic and fifth and seventh cervical vertebrae. The semispinalis thoracis is innervated by dorsal branches of the cervical and thoracic nerves and supplied by branches of the aorta. These muscle straps give the spine its flexibility to bend, as when taking a deep bow.
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The semitendinosus muscle originates from the ischium. Its long, narrow, fleshy belly ends two- thirds of the way down the thigh at its tendon, which inserts in the upper part of the tibia. It sits in the muscular groove formed in the semimembranosus muscle at the inner back of the thigh. The semitendinosus is innervated by the tibial nerve and supplied by the tibial artery. This muscle flexes the lower leg and extends the thigh at the hip joint. It is considered one of the hamstring muscles. Its tendon, along with the tendons of the semimembranosus and the gracilis muscles, forms the inner hamstring.
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Senna is a purgative consisting of the leaves of the shrub Cassia actuifolia.
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Senox is a brand name for Amoxicillin.
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Seotal is a tarde name for secobarbital.
Research Seotal
Seplophobia is the fear of decaying matter.
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Sepsis is blood or tissue poisoning caused by bacteria.
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Septic is a term describing tissue in a state of sepsis. Usually the term is applied to cuts and wounds in an animal which have become infected.
Research Septic
Septic meningitis is usually due to extension of infection to the pia mater from adjacent structures. Thus, it arises commonly from chronic infection of the middle ear, infection of the scalp, fractured skull, and bullet wounds of the head, which are common in war-time. At the time of injury the patient may merely feel upset, but deeper trouble may be taking place inside the skull. For this reason all injuries to the head, even though they may appear to be trivial, should be carefully watched. Moreover, in all cases where meningitis is suspected the ear drum should be examined. As in all forms of acute meningitis, there is headache, vomiting and drowsiness, accompanied by high fever with rigors (attacks of shivering as the temperature rises). Later there is restlessness with delirium, and a painful stiff neck so that the head is drawn backwards.
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Septicaemia is a pathological term describing blood poisoning by bacteria.
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The septum is a thick muscular wall that divides the heart lengthwise into the left and right sides. Before birth, an opening known as the foramen ovale in the septum allows oxygen from the mother to flow directly from the right to the left atrium, by-passing the lungs which do not function until the moment of birth. The foramen ovale normally closes at birth, but occasionally it remains open, resulting in poor circulation through the lungs where it fails to take up enough oxygen, causing the skin of the new-born child to turn blue. This condition is known as a hole in the heart and can often be repaired by surgery.
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The septum pellucidum is a wall of two thin laminae of grey and white matter which extend from the center of the corpus callosum to the fibres of the fornix.
Research Septum Pellucidum
Serotherapy is the treatment of disease by the injection of serum containing antibodies to the disease.
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Serotonin or 5-hydroxytryptamine (5-HT) is a compound widely distributed in human tissue, particularly in the blood, wall of the intestine and the central nervous system. It acts as a neurotransmitter concerned especially with the process of sleep.
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A serous membrane is a membrane that lines certain areas inside the body, such as the sac that surrounds the heart. Between the inner layer of serous membrane covering various organs and the outer layer of the organ itself is a space kept wet by a lubricating serous fluid that allows the covered organ to move easily, such as the lungs, which move during breathing.
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Seroxat (paroxetine) is an anti-depression drug which causes central nervous system stimulation by the inhibition of serotonin uptake. It has been noticed, however, that suicide rates among those prescribed Seroxat and other serotonin reuptake inhibitors is significantly higher than among those patients who do not take the drugs, revealing that far from reducing depression, Seroxat and similar drugs increase it.
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The serratus anterior (serratus magnus; costoscapularis) is a large quadrilateral muscle that curves along the rib cage. The muscle originates from several bundles from the first eight to nine ribs and extends along the side and upper border of each rib. It then divides into two portions, and upper and lower portion. The upper portion lies along the upper side of the rib cage and the armpit. The lower portion consists of five or six pointed digitations which create a fan-shaped mass extending from the scapula. The serratus anterior inserts in the inferior and superior angles of the scapula. It is innervated by branches from the brachial plexus and supplied by the thoracic artery and partly by the thorocodorsal artery. This muscle is used everytime you reach out or push forward with your arms. It also helps raise the shoulder joint when lifting your arm above your head.
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The serratus posterior superior and inferior muscles lie deep on the front part of the neck. The serratus posterior superior is a thin, flat, quadrilateral muscle that extends from the neck to the third, fourth, and fifth ribs. It is innervated by the first through fourth intercostal nerves. The serratus posterior inferior is broader than the serratus posterior superior and extends to the four lower ribs. It is innervated by the ninth through twelfth intercostal nerves. Both muscles are respiratory muscle. The serratus posterior superior elevates the ribs as you inhale and the serratus posterior inferior pulls the ribs down and back to exhale.
Research Serratus Posterior Inferior
The serratus posterior superior and inferior muscles lie deep on the front part of the neck. The serratus posterior superior is a thin, flat, quadrilateral muscle that extends from the neck to the third, fourth, and fifth ribs. It is innervated by the first through fourth intercostal nerves. The serratus posterior inferior is broader than the serratus posterior superior and extends to the four lower ribs. It is innervated by the ninth through twelfth intercostal nerves. Both muscles are respiratory muscle. The serratus posterior superior elevates the ribs as you inhale and the serratus posterior inferior pulls the ribs down and back to exhale.
Research Serratus Posterior Superior
Sertraline is a selective serotonin re-uptake inhibitor drug. It is used to treat depression.
Research Sertaline
Servamox is a brand name for Amoxicillin.
Research Servamox
Sesquipedalophobia is the fear of long words.
Research Sesquipedalophobia
Sexophobia is the fear of the opposite sex.
Research Sexophobia
Sexually transmitted disease (STD) is a general term that refers to as many as twenty different illnesses. These are transmitted by sex - usually through the exchange of bodily fluids such as semen, vaginal fluid, and blood. STD's such as herpes, can be acquired by kissing or close contact with infected areas - not just intercourse. If left untreated, STD's can cause permanent damage that leaves you blind, brain-damaged, or sterile. The most common STD's are chlamydia, herpes, gonorrhea, genital warts, syphilis, hepatitis B, crabs, and trichomoniasis. STD's can be prevented, most can be cured. They infect men, women, and children. Mothers can also transmit STD's to their babies. Anyone at any age can be a victim. It is not true that having had an STD once and having been cured, you will not get it again. Anyone who has sex can get a sexually transmitted disease and millions do. More than 4 million people get chlamydia each year. Genital herpes affects an estimated thirty million Americans, with as many as 500,000 new cases reported each year. There are over one million cases of gonorrhea each year. And syphilis, once thought to be on the decline, made a rising comeback in the 1990s.
Research Sexually Transmitted Diseases
In human anatomy, short bones are part of the skeleton designed for strength and compactness and occur where the skeleton primarily requires strength. They are comprised of a spongy substance surrounded by a thin crust of compact bone.
Research Short bones
The shoulder joint, also known as the glenohumeral joint, is the articulation between the head of the humerus and the glenoid cavity of the scapula. The articulation is reinforced by connective tissue which creates the joint capsule. The coracohumeral ligament is one of these connective tissues and serves to reinforce the capsule's upper part.
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Sia-mox is a brand name for Amoxicillin.
Research Sia-mox
Siamese Twins are human twins born attached together. The attachment may be anything from a finger to a single body with two heads.
Research Siamese Twins
Siderodromophobia is the fear of rail travel.
Research Siderodromophobia
Siderophobia is the fear of stars.
Research Siderophobia
Siderosis is a lung disease caused by breathing in fine particles of iron or other metallic dust.
Research Siderosis
A sigmoidoscope is a long tubular speculum used for sigmoidoscopy, that is a form of endoscopy involving the examination of the upper regions of the rectum and the sigmoid or pelvic colon.
Research Sigmoidoscope
Sigmopen is a brand name for Amoxicillin.
Research Sigmopen
Sil-A-mox is a brand name for Amoxicillin.
Research Sil-A-mox
Silibrin is a tarde name for Chlordiazepoxide hydrochloride.
Research Silibrin
Silicosis is an occupational disease (pneumoconiosis) caused by the inhalation of silica dust which causes small concentrations of inflammation and scarring of the lungs. Over time the result of silicosis is shortness of breath, and increased susceptibility to infection of the lungs. Silicosis particularly affects miners and those working with stone.
Research Silicosis
Silvester's method is a method of artificial respiration in which the patient lies on his back with a folded coat or blanket under the upper part of the thorax. The patient's arms, flexed at the elbow, are abducted and taken above his head so that the pectoral muscles elevate the ribs and expand the chest. As the arms are brought down, with pressure against the sides of the chest, forced expiration is produced. This method really requires an assistant to hold the tongue forward, in order to preserve the airway: a safety pin can be put through the dorsum of the tongue and attached to a string held by the assistant.
Research Silvester's Method
Simoxil is a brand name for Amoxicillin.
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Simplamox is a brand name for Amoxicillin.
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Simples is an old term for any medicinal herbs.
Research Simples
Sinistrophobia is the fear of left-handedness.
Research Sinistrophobia
Sinophobia is the fear of Chinese people and things.
Research Sinophobia
A sinus is an air-filled space in the diploe of a skull bone.
Research Sinus
Sitophobia is the fear of food or eating.
Research Sitophobia
The skeleton is the hard internal or external framework of bones, cartilage or shell which provides protection for an animals organs, provides fixing points for the muscles and a general frame for the body. Two hundred and six bones compose the skeleton, about half of which are in the hands and feet. Most of the bones are connected to other bones at flexible joints, which lend the framework a high degree of flexibility. Only one bone, the hyoid, is not directly connected to another bone in such an articulation. It anchors the tongue and is attached to the styloid processes of the skull by ligament. The skeletons of male and female bodies are essentially the same, with the only noteworthy exceptions being that female bones are usually lighter and thinner than male bones, and the female pelvis is shallower and wider than the male's. This latter difference makes childbirth easier.
Research Skeleton
The skin (cutaneous membrane) is the large, supple membrane that covers the entire surface of the body, and as such has the largest surface area of any organ in the body and is also the heaviest. The skin is composed of two tissues, an outer layer called the epidermis and an inner layer called the dermis or corium. On the surface are the sensitive papillae, and within are certain organs with special functions, the sweat glands, hair follicles, and sebaceous glands. The skin protects the internal organs of the body against infection, injury, and harmful sun rays. It also plays an important role in the regulation of body temperature. Although the skin of an average-sized adult may weigh as much as twenty pounds, it is only paper thin in some places and not much thicker in others.
Research Skin
The skull is one of the principle groups of bones in the human anatomy. The skull consists of twenty-six bones: eight bones form the skull, which houses the brain and ear ossicles, plus fourteen facial bones, which form the front of the face, jaw, nose, orbits, and the roof of the mouth, three more bones make up the inner ear ossicles, and one more, the hyoid bone, is in the neck and is attached to the temporal bone by ligaments and anchors the tongue. The skull also contains a dental arcade of teeth, which are technically not bones, though they do share some of the compositional characteristics of bone tissue. Children may grow twenty deciduous teeth, which will eventually fall out and be replaced by the permanent teeth. The bones of the skull include the frontal bone, the occipital bone, two parietal bones, and two temporal bones. The lower rearmost part of each temporal bone is called the mastoid process, but because it is separated from the temporal bone, proper, by a suture, it is often considered a separate bone. The sphenoid bone forms the central base of the skull and spans the skull from side to side, the greater wings forming side plates of the skull. The sections of the ethmoid bone are positioned between the orbits, forming the walls and roof of the nasal cavity, while the three middle ear ossicles (stapes, malleus, and incus) are located within the temporal bones on each side of the skull. The U-shaped hyoid bone is found in the neck, and is attached by ligaments to the temporal bones. In the face, the two maxillary bones form much of the orbits, nose, upper jaw and roof of the mouth, while the zygomatic bones form the cheeks. The lachrymal bones are located on the inner sides of the orbits and are attached to the ethmoid bone and maxillary bones. Within the nasal cavity, the vomer is located in the low center and forms the thin flat bone of the nasal septum, while two inferior urbinates form the lower sides of the cavity and two palate bones form
e floor of the nasal cavity as well as the roof of the mouth.
The mandible is the only movable part of the skull, forming the lower jaw and mounting the teeth. The bones of the skull, with the exception of the mandible, are held together by very thin sutures, or seams, in which the periosteum of the individual bones interweave with each other, and are cemented by a fibrous, connective tissue. In the newborn, these sutures are not yet developed, with the bones being attached by cartilage which ossifies over time as the bones of the skull fuse together. The most evident external sutures of the skull include the coronal suture, joining the frontal bone and parietal bone, the sagittal suture, joining the parietal bones to each other, the lambdoid suture, joining the occipital and parietal bones, the squamous suture, joining the temporal and sphenoid bones to the parietal bone on each side of the skull.
The pterion is the short segment of the suture joining the squamous and parietal bones. The bones of the skull also feature a number of sinuses and foramina. Four pairs of sinuses flank the nasal cavity. Two are found in the maxillary bone, and are called maxillary sinuses. The sphenoid bone forms two paranasal sinuses called the sphenoids, and the ethmoid bone forms the two paranasal sinuses called ethmoids. Additionally, the frontal sinuses are located in the frontal bone just behind the roof of each orbit. The foramen magnum is a large, round opening in the base of the skull which admits the spinal cord, while at the base of each temporal bone is the external auditory meatus, which serve as the auditory canals. Just above each orbit in the frontal bone is a small notch or hole, called a supraorbital foramen, and just below each orbit, in the maxillary bone, is an infraorbital foramen. Two more openings, one on each side of the skull, can be found in the frontal processes of the zygomatic bones, and are called zygomatofacial foramina. On each side of the mandible, just below the lower canines, are the mental foramina. These facial foramina serve to admit blood vessels and nerves through and into the bone. The teeth are mounted in the maxillary bone and the mandible, and are brought together for chewing by the hinge-like motion of the mandible. An average adult will have thirty-two teeth, evenly arrayed on the maxilla and mandible.
Research Skull
Sleeping sickness (Trypartosomiasis) is caused by the Trypanosoma gambiense parasite, discovered in 1902. The disease is spread by various flies called Tsetse flies (Glossina), and the parasites live in the intestines and salivary glands of infected flies; when they bite a human being the parasite is transferred to the wound and thence to the patient's blood. The disease is confined principally to Africa and South America, where whole native districts are said to have been depopulated. An inflamed patch develops round the bite, and is followed within seven to fourteen days by fever. There is a long latent period after infection, and the onset is slow and insidious, with intermittent fever. The patient suffers from headache and weakness, and sometimes an eruption appears. In the early stage of the disease the patient is mentally dull, the pulse is rapid and there is malaise; the spleen and glands become enlarged. The patient may recover, or the disease become chronic. After a variable period of from three months to three years, if recovery does not follow, stage two develops, with increasing weakness, fatigue, fever, tremors, slow speech, uncertain shuffling gait, neuralgia and cramps, apathy, melancholy or irritability, and vacancy of facial expression; memory and intelligence are impaired. With treatment the patient may recover even at this stage. In stage three, however, the patient sinks into a lethargic or paralytic condition, sometimes with convulsions or delirium, and is unable to speak or stand. The temperature is low, and the body is emaciated. Death is inevitable and generally occurs within eighteen months from meningitis or coma.
Research Sleeping Sickness
The small intestine is descriptively divided into three sections: the duodenum, the ileum, and the jejunum. The duodenum accepts the digested food paste, called chyme, from the stomach, through the pylorus sphincter. The duodenum is about ten inches long and forms a curve around the head of the pancreas. The duodenum secretes digestive enzymes invertase and erepsin, necessary for digestion. The gall bladder, liver, and pancreas also deposit enzymes and bile into the duodenum. The jejunum is the intermediate section of the small intestine, measuring a little over two meters long. The jejunum carries digested food through the small intestine rapidly by peristaltic waves and, as a result, seldom has much food matter in it. It is connected to the abdominal wall by the mesentery. The ileum is the last, and longest, segment of the small intestine, measuring up to four meters or longer. Most of the absorption of useful food nutrients takes place in the ileum before it empties out into the cecum of the large intestine.
Research Small Intestine
Smallpox (Variola) is an acute contagious disease characterised by fever and the appearance on the body of an eruption, which passes through the stages of papule, vesicle, pustule and scab.
Research Smallpox
The smell receptors are located at the base of each cilia located in the mucous membrane at the top of the nasal cavity. There are about 50 million nerve fibres leaving the olfactory mucosa on each side of the nose. These link with a further 50,000 nerve fibres which carry messages to the frontal lobes of the brain.
Research Smell Receptors
Smooth-muscle cells are not attached to the skeleton, but are found in the walls of the blood vessels, the digestive tract, and in the dermal layer of the skin. They react slowly to stimuli from the autonomic nervous system and perform actions such as forcing food through the intestines, transporting urine to the kidneys and pumping blood through blood vessels. The muscle is non-striated and consist of spindle-shaped, uni-nuclear cells that are not bound together, as in skeletal muscle. Like skeletal muscle, smooth muscle has fibrillae but without cross striations. The muscles are involuntary, and are slow-acting, untiring, and weak in action.
Research Smooth Muscle
Snakephobia is the fear of snakes.
Research Snakephobia
Soceraphobia is the fear of parents-in-law.
Research Soceraphobia
Social phobia is the fear of being evaluated negatively.
Research Social phobia
Sociophobia is the fear of society.
Research Sociophobia
Sodium propionate is a transparent crystalline soluble substance used as a medical fungicide and to prevent the growth of moulds, especially to retard spoilage in packaged foods.
Research Sodium proponate
The palate forms the roof of the mouth. The soft palate is a continuation of the hard palate which is located in the front of the mouth and made up of portions of the maxillary bones. The soft palate is a moveable fold of mucous membrane suspended in the back of the mouth, forming an arch and an incomplete septum between the mouth and pharynx.
Research Soft Palate
The solar plexus is a network of nerves situated in the abdomen behind the stomach. It surrounds the coeliac axis, the thick short artery which is a branch of the aorta. The solar plexus contains several ganglia or collections of nerve cells, and from it nerve filaments go to all the abdominal viscera. A blow to the pit of the stomach is the so-called solar plexus blow in boxing and temporarily paralyses the sensitive network of nerves.
Research Solar Plexus
The soleus is a thick muscle located on the back of the lower leg. It originates from the upper part of the fibula and the tendonous arch connecting the head of the fibula to the tibia. The muscle is thickest at its mid-section where its flattened form curves around the deep flexor muscles of the foot and toes. The muscle tapers low, just above the ankle, and its tendon continues on inserting in the middle part of the calcaneum. The tendon of the soleus, combined with the gastrocnemius, is best known as the achillis tendon. The soleus is innervated by the tibial nerve and supplied by the tibial artery. This muscle is used to point the foot or raise the heel, which lifts the body. Its continuous contraction of the soleus prevents the body from falling forward when standing.
Research Soleus
Somnambulism is walking while asleep. The habit is most common amongst children.
Research Somnambulism
Somniphobia is the fear of sleep.
Research Somniphobia
Sonimen is a tarde name for Chlordiazepoxide hydrochloride.
Research Sonimen
Sophophobia is the fear of learning.
Research Sophophobia
Sordes are crusts which form on the lips of sick persons suffering from extreme exhaustion. They are especially associated with typhoid.
Research Sordes
Soteriophobia is the fear of dependence on others.
Research Soteriophobia
Spacephobia is the fear of outer space.
Research Spacephobia
A spasm is an involuntary contraction of a muscle or group of muscles. A short, repeated contraction or twitching of a muscle is known as a clonic spasm, a continuous contraction as a tonic spasm.
Research Spasm
Specillin is a brand name for Amoxicillin.
Research Specillin
Spectrophobia is the fear of specters or ghosts.
Research Spectrophobia
A speculum is an instrument for temporarily stretching a cavity of the body so that a physician may examine the deeper parts.
Research Speculum
The spermatic cords are the intermediary pathways beginning with the vas deferens and joining to form the ejaculatory duct. Nerves, arteries, veins, and lymphatic glands join the vas deferens to compose these cords.
Research Spermatic Cords
Spermophobia (bacteriophobia) is the fear of germs.
Research Spermophobia
Spheksophobia is the fear of wasps.
Research Spheksophobia
The sphenoid bone is one of the cranial bones and spans the inside of the skull laterally. The sphenoid bone has four wings: two greater and two lesser. The greater wings form part of the sides of the skull, with one greater wing on each side and extending inward to form also part of the back surface of each orbital cavity. The two lesser wings form a small part of the back surfaces of the orbital cavities, and meet in the middle of the skull. The sphenoid bone features two paranasal cavities, or sinuses, called the sphenoids.
Research Sphenoid Bone
Sphexsophobia is the fear of wasps.
Research Sphexsophobia
The sphincter ani externus is a sphincter muscle that surrounds and together with the spincter ani internus, close the anus. It is attached to the coccyx and to the central tendon of the perineum.
Research Sphincter Ani Externus
The spincter ani internus is a ring of smooth muscle surrounding the upper end of the anal canal.
Research Sphincter Ani Internus
The spincter urethra (compressor urethrae; constrictor urethrae; Guthrie's muscle; Wilson's muscle) originates from the ramus of the pubis and inserts in the median raphe behind and in front of the urethra. The flow of urine is controlled by muscles in the bladder wall and outlet. The sphincter urethra is innervated by the pudenal nerve.
Research Sphincter Urethra
The sphincter vagina is a small muscle surrounding the opening of the vagina. It is attached to the perineum and the external sphincter ani. Its point of insertion is the corpora cavernosa of the clitoris. The sphincter vagina is innervated by a branch of the pudic nerve and is supplied by the pudic artery.
Research Sphincter Vagina
A sphygmograph or pulsometer was an old medical instrument for recording the movements of the arterial wall during and between the pulse beats. One of the earliest forms was invented by Marey, and consists of a lever with an elastic spring. One end of the spring is placed on the radial artery, and has above it a rack and pinion attached to a lever. The other end of the lever carries a style, which records on a moving smoked plate the movements of the vessel wall. The smoked plate is moved at a known rate by clockwork, and the pressure of the spring upon the artery can be regulated by a screw.
Research Sphygmograph
The spinal accessory nerve is the eleventh cranial nerve, branching from the trigeminal nerve and the spinal cord, between the first and fourth cervical vertebrae. The spinal accessory nerve divides into a number of branches which innervate important structures. These include the cervical lymph glands, the larynx, the pharynx, and the sternomastoid and trapezius muscles.
Research Spinal Accessory Nerve
The spinal cord is one of the primary portions of the central nervous system, serving as a medium for signals to be sent from the brain to the structures of the body, and received from them in return. Extending from the medulla oblongata, through the foramen magnum in the base of the skull, to the base of the vertebral column, the spinal cord is about half of a centimeter in diameter, and is slightly flattened. The spinal cord itself passes through the vertebral canal created by the vertebral arches, and sends out roots and branches. These structures contain bundles of nerve fibres which extend all the way down the body, innervating even the skin of the tips of the toes. The spinal cord features both efferent and afferent nerve pathways, so that nerves may be transmitted to the body's structures as well as received from them. Paired sets of nerves branch out from the spinal cord along the vertebral column, with the lowest of these forming the sacral plexus of nerves. The sympathetic nerves travel alongside the spinal cord in the sympathetic nerve trunk, which features periodic clusters of nerves, called ganglia, which deal with specific organ groups. The spinal cord floats in a spinal fluid which protects and nourishes it and, as with the brain, is covered by a meningeal membrane composed of three layers: the pia mater, the arachnoid, and the dura mater. Damage to the spinal cord results in inability to transmit and receive nerve impulses to and from the specific area supplied by the damaged section of the spinal cord, and all sections below it, resulting in paralysis and numbness. Inflammation of the spinal covering is a condition called spinal meningitis.
Research Spinal Cord
The spinal nerves are those which originate in the spinal cord and carry impulses to muscles (and other structures) and from sensory organs. They feature both efferent and afferent nerves. Efferent nerves send impulses out to the muscles and other structures and connect with the spinal cord in the anterior roots. Afferent nerves carry impulses from sensory organs to the spinal cord and connect in posterior roots. The spinal nerves include, in alphabetical order, the celiac, the femoral, the genitofemoral, the gluteal, the hemmorhoidal, the hepatic, the hypogastric, the iliohypogastric, the ilioinguinal, the intercostal, the intercostobrachial, the interosseus, the median, the mesenteric, the musculocutaneous, the obturator, the pelvic, the peroneal, the phrenic, the pudendal, the radial, the renal, the saphenous, the scapular, the thoracic, the tibial, and the ulnar nerves.
Research Spinal Nerves
The spinales are human muscles which extend the vertebral column.
Research Spinales
The spinalis capitis muscle (biventer cervicis) is a small muscle situated on the inner side of the spinalis cervicis. It is an extension of the spinalis cervicis and extends upward to the occipital bone, or it may fuse with the semispinalis capitis. The spinalis muscles link the vertebrae, helping you to stand upright. The spinalis capitis is innervated by dorsal branches of the cervical nerve and is supplied by muscular branches of the aorta.
Research Spinalis Capitis
The presence of the spinalis cervicis muscle (spinalis colli) varies from individual to individual. When present, it is a small muscle that originates from the sixth and seventh cervical vertebrae and inserts in the axis and third cervical vertebra. This muscle extends the cervical spine. The spinalis muscles link the vertebrae, helping the body to stand upright. The spinalis cervicis is innervated by dorsal branches of the cervical nerve and is supplied by muscular branches of the aorta.
Research Spinalis Cervicis
The spinalis thoracis muscle (spinalis dorsi) originates from the spinous processes of the upper lumbar and two lower thoracic vertebrae. It inserts in the spinous processes of the middle and upper thoracic vertebrae. The spinalis thoracis muscle is innervated by branches of the thoracic and lumbar nerves and is supplied by muscular branches of the aorta.
Research Spinalis Thoracis
Spine is a popular term for the vertebral column (spinal column).
Research Spine
The spine of the scapula is a ridge which runs laterally along the posterior surface of the bone. This spine separates the surface of the back of the scapula into two unequal areas: the supraspinous fossa and the infraspinous fossa. The spine continues laterally to form the coracoid process and the acromion (which articulates with the clavicle). The spine and these two projections serve to anchor much of the connective tissue in the shoulder. The trapezius and deltoid muscles are especially responsible for giving the scapula its stability and strength during movement.
Research Spine of the Scapula
The spinous process is a projection of bone from the arch of almost every vertebra toward the posterior. This projection is located at the apex of the arch and bordered on the arch by the laminae. It is the series of these processes which is visible as the bumps beneath the skin on the back. The spinous process serves as an anchor point for ligaments which help control the flexibility of the spine. The vertebrae feature different types of spinous processes. Typical cervical vertebrae have bifid spinous processes, with the exception of the atlas which has no
spinous process. Thoracic vertebrae generally have a single tubercle, and point downward as well as back. The lumbar vertebrae feature spinous processes which are rectangular or hatchet-shaped and have a section which points back and one which points down. The spinous processes of the sacrum and coccyx are generally fused together, to form a ridge called, in the sacrum, the sacral crest. Often, the coccygeal vertebrae (fused or not) show no evidence of any ridge, crest, or
spinous process.
Research Spinous Process
The spleen is a solid organ lying between the left wall of the stomach and the diaphragm, protected by the lower ribs and held in position by its capsule which is formed of peritoneum. Its very large artery comes almost directly from the aorta and its vein is one of the main tributaries of the portal system. The spleen has many functions which are known and probably others which are not known. It contains smooth muscle and is capable of contracting. It has a sponge-like structure in which the sinuses or spaces of the sponge are filled with blood. By its power of contraction it is able to expel into the circulation a large amount of this reserve blood, to meet sudden demands such as may be produced by shock or haemorrhage. In addition to this reservoir function, the spleen is the 'headquarters' of the reticulo-endothelial system. Cells of this system are found in various parts of the body, the liver, lymph glands and bone marrow. The function of the reticulo- endotheliai system with its macrophage cells is to deal with foreign particles which circulate in the blood or gain entrance to the tissues, such as bacteria, viruses and other tissue cells. Red blood cells are being continuously destroyed in the spleen. It is probable that antibodies against disease are also produced by the reticulo-endothelial system and by the masses of lymphatic tissue to be found in the spleen.
Research Spleen
A splenectomy is the surgical removal of the spleen. It may be necessary following injury to the spleen, or in the course of some blood diseases.
Research Splenectomy
The splenic artery is the largest of the three branches of the celiac artery. It extends outward from the celiac artery to the spleen, where is divides into branches that supply the spleen.
Research Splenic Artery
The splenic vein arises from five or six branches which return blood from the spleen. The splenic vein merges with the superior mesenteric vein to form the portal vein.
Research Splenic Vein
The splenius capitis muscle runs along the back of the neck and joins the skull and spine. It is narrow and pointed at its origin from the last four cervical vertebrae and the supraspinous ligament of the first and second thoracic vertebrae. It becomes broader, dividing into two portions with separate insertions. The splenius capitis is inserted into the mastoid process of the temporal bone and the splenius colli (splenius cervicis) is inserted in two or three upper cervical vertebrae. The splenius capitis is innervated by dorsal branches of the second to sixth cervical nerves and is supplied by muscular branches of the aorta. It is used to rotate and tilt the head from side to side.
Research Splenius Capitis
The splenius cervicis (splenius colli) muscles originate from the spinous processes of the third, fourth, and fifth thoracic vertebrae and extend upward to insert into the posterior tubercles of the transverse processes of the first, second, and third cervical vertebrae. These muscles are important to movement of the head. They extend and rotate the neck. They are innervated by dorsal branches of the fourth to eighth cervical nerves and supplied by branches of the aorta.
Research Splenius Cervicis
A splint is a medical structure used to immobilise a broken or diseased limb.
Splints may be made of any material, for example wood, leather, zinc, aluminium, or perspex. A fractured limb may be immobilised in an inflatable plastic splint as a first-aid measure, and a more permanent and less bulky splint applied later, moulded to the shape of the limb, for example plaster-of-Paris bandages, applied wet and allowed to harden, or glass-fibre bandages, which are lighter and more waterproof. Other splints are available for treatment of deformities and diseased limbs. Lively splints, which give support while at the same time allowing movement against tension springs, are used to restore hand function. Padded splints are used for babies with congenital dislocation of the hips. The legs are held in such a position that the hip joint develops normally.
Research Splint
Spotted fever is a name given to various severe febrile diseases characterised by small irregular spots on the skin, such as Rocky Mountain spotted fever and tick fever.
Research Spotted Fever
Sputum is mucus coughed up from the respiratory tracts.
Research Sputum
Squill is a medicine derived from the bulb of the squill plant. Squill resembles digitalis in its action, but its effects on the heart and blood vessels are much more powerful. In large doses Squill produces nausea and vomiting, and as such it was at one time used as an emetic. In smaller doses it mildly irritates the stomach, and produces reflex secretion from the bronchioles, and it is this characteristic that causes it to be much used as an expectorant in the treatment of coughs in chronic bronchitis.
Research Squill
The stapedius is a small ear muscle. It originates from the walls of the tympanic cavity and inserts in the neck of the stapes. It is innervated by branches of the trigeminal nerve through the otic ganglion.
Research Stapedius
Stasibasiphobia is the fear of standing or walking.
Research Stasibasiphobia
Stasophobia is the fear of standing.
Research Stasophobia
Staurophobia is the fear of crosses or the crucifix.
Research Staurophobia
Stelazine is a tarde name for trifluoperazine hydrochloride.
Research Stelazine
Stenophobia is the fear of narrow things or places.
Research Stenophobia
Stenson's duct is the duct leading from the parotid gland to the inside of the cheek, where it discharges saliva.
Research Stenson's Duct
The sternocleidomastoid (sternocleidomastoideus; sternomastoid) muscle is located in the neck. It is a thin, broad muscle that narrows at the center. It originates from two heads, one from the sternum and and one from the clavicle , and runs upward, inserting into the mastoid process. The sternocleidomastoid muscle is innervated by the accessory nerve and the cervical plexus. It is supplied by the occipital artery ans the superior thyroid artery. This muscle is used to tilt the head from side to side.
Research Sternocleidomastoid
The sternohyoid (sternohyoideus) is a narrow, ribbon-thin muscle located on the front of the neck. It originates on each side of the neck from the clavicle and the upper part of the first piece of the sternum (breast bone). The muscles run upward and come together in the middle of their course (both pieces of the muscle lie side by side), but do not actually touch and are inserted in the front of the hyoid bone. The muscle is innervated by the upper cervical nerves through the ansa cervicalis and is supplied by the inferior and superior thyroid arteries. This muscle pulls the hyoid bone down, as in swallowing, and assists in flexion of the head and neck.
Research Sternohyoid
The sternomastoid is a muscle in the human neck.
Research Sternomastoid
The sternothyroid (sternothyroideus) is a short wide muscle that lies just beneath the sternohyoid muscle. It originates from the first bone of the sternum (breast bone) and from the edge of the cartilage of the first rib and is inserted into the thyroid cartilage. It is innervated by the upper cervical nerves through the ansa cervicalis and is supplied by the inferior and superior thyroid arteries. This muscle acts as a depressor of the thyroid cartilage.
Research Sternothyroid
In anatomy, the sternum is a flat, blade-like bone located at the center of the chest. It serves as the anterior site of articulation for the ribs via cartilaginous connections, called costal cartilage. The pectoralis major also anchors to the sternum, giving the shoulder joint much of its strength during flexion of the arm. The sternum features two articulations in addition to its costal articulations. One of these, called the manubriosternal joint, is between the body of the sternum and the broader upper section, called the manubrium. The manubrium of the sternum articulates with the clavicles and the sternocleidomastoid, sternohyoid, and sternothyroid muscles connect here. The lower articulation is called the xiphisternal joint, and is between the body of the sternum and a small, teardrop-shaped bone called the xiphoid process. The xiphoid process anchors the rectus abdominis, the transverse thoracic, and the diaphragm muscles, responsible for much of the muscular expansion and contraction of the abdomen.
Research Sternum
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Abbreviations
Medicine
