|
The choroid plexus is a vascular layer of the inner eye that lies between the retina and sclera. It is composed of a thin network of branching blood vessels that bring a constant supply of oxygen and nutrients to the retina. The choroid, along with the iris and ciliary body, constitute the uveal tract which is the pigmentary, or middle, portion of the eye.
 Research Choroid Plexus
The conjunctiva is a thin, transparent membrane that surrounds the sclera of the eye and lines the inside of the eyelid. The cells of the conjunctiva produce a fluid similar to tears that lubricates the lids and the cornea making it easier to blink. Conjunctivitis, often called pink-eye, is a common infection of this area. Conjunctivitis can be bacterial or viral in nature. The infection causes the area to become red and irritated, hence the name 'pink-eye'.
Research Conjunctiva
Conjunctivitis is a bacterial or viral infection of the conjunctiva of the eye. It may also be caused by sensitivity to certain cosmetics or drugs. It is a very common complaint characterised by a gritty and burning sensation of the eye and discomfort when moving the eye. The sclera becomes red and irritated and the eyes have a sticky, yellow discharge. In most cases, both eyes become inflamed. The infection is spread easily through towels or wash-cloths.
Research Conjunctivitis
The inferior oblique is a thin narrow muscle that originates from the orbital surface of the maxilla and extends along the inner side of the eyeball. It helps move the eye sideways and rotates it slightly. The inferior oblique muscle works in conjunction with the other eye muscles to move the eye. These muscles are anchored to the sclera near the cornea. The
inferior oblique muscle is innervated by the third cranial (oculomotor) nerve.
Research Inferior Oblique
The rectus inferior muscle pulls the eye downward. It works in conjunction with the other eye muscles to move the eye. The rectus inferior muscle originates from a ring of tendons within the orbit and inserts in the sclera near the cornea. It is innervated by branches of the third cranial nerve (oculomotor). The brain sends messages along the nerve to the muscles in each eye, causing them to move both eyes in the same direction at once. When there is an imbalance in strength of right and left rectus inferior muscles, a person may appear cross- eyed, or wall-eyed.
Research Rectus Inferior Muscle
The rectus lateralis (abducens oculi; rectus externus) muscle pulls the eye to the outside. It works in conjunction with the other eye muscles to move the eye. The rectus lateralis originates from a ring of tendons within the orbit and inserts in the sclera near the cornea. It is innervated by the abducens nerve (VI cranial nerve). The brain sends messages along the nerve to the muscles in each eye, causing them to move both eyes in the same direction at once. When there is an imbalance in strength of these muscles, a person may appear cross- eyed, or wall-eyed.
Research Rectus Lateralis Muscle
The rectus superior ((attolens oculi) muscle pulls the eye up. It originates from a ring of tendons within the orbit and inserts in the sclera near the cornea. It is innervated by branches of the third cranial nerve (oculomotor).
Research Rectus Superior Muscle
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.
Research Sclera
|
The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2009 The Probert Encyclopaedia
Southampton, United Kingdom
|
|
|
Abbreviations
