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An abductor is a type of muscle which serves to draw a part out, or form the median line of the body, such as for example the abductor oculi, which draws the eye outward.
 Research Abductor
The abductor digiti minimi manus is the largest of the hypothenar eminence, the muscle mass of the little finger. The hypothenar eminence is located on the outside of the palm and hand. It consists of the abductor digiti minimi, the flexor digiti minimi, the opponens digiti minimi, and the palmaris brevis. The abductor digiti minimi is a superficial muscle that originates from the tip of pisiform bone and from the flexor carpi ulnaris. It wraps around the ulnar side of the hand and up to the side of the metacarpal of the little finger, inserting in the ulnar side of the base of the little finger. It is innervated by the ulnar nerve and supplied the ulnar artery. This muscle abducts and flexes the little finger.
Research Abductor Digiti Minimi Manus
The abductor digiti minimi pedis (abductor digiti quinti) muscle lies under the outside border of the foot. It originates from the calcaneum and runs along the outer edge of the foot, inserting into the outer side of the base of the first phalanx of the little toe. It is innervated by the lateral plantar nerve and supplied by the plantar artery. This muscle is for the most part concealed by the dense, fibrous fat pad of the sole of the foot. It works to flex and draw the little toe away from the foot.
Research Abductor Digiti Minimi Pedis
The abductor hallucis flexes more than it abducts the big toe. It has an elongated, rectangular form that begins from a wide origin on the bottom of the calcaneous, the edge of the flexor retinaculum, and the plantar aponeurosis (a strong fibrous band of fascia that extends along the bottom of the foot) and inserts on the inside of the base of the first phalanx of the big toe. It is innervated by the medial plantar nerve and supplied by the plantar artery.
Research Abductor Hallucis
The abductor ossis metatarsi quinti is a foot muscle that extends from the abductor digiti minimi pedis. Its point of insertion is the 5th metatarsal. This small muscle helps abduct the little toe. It is supplied by the lateral plantar artery and is innervated lateral plantar nerve.
Research Abductor Ossis Metatarsi Quinti
The abductor pollicis brevis is one of the muscles forming the thenar eminence, the muscle mass of the thumb. The abductor pollicis brevis is the largest of the thenar eminence muscle group and is flat, elongated and triangular in shape. It lies just below the skin and slightly overlaps the flexor pollicis brevis and mostly covers the opponens pollicis. The abductor pollicis brevis originates from the tubercle of the trapezium and from the flexor retinaculum. It inserts in the proximal phalanx of the thumb. This muscle is innervated by the median nerve and supplied by palmar branches of the radial artery. It moves the metacarpal bone of the thumb away from the palm.
Research Abductor Pollicis Brevis
The abductor pollicis longus muscle, combined with the extensor pollicis brevis, creates a narrow, triangular muscle form which wraps around the lower end of the radius. The abductor pollicis longus originates on the back side of the ulna and radius and inserts at the base of the metacarpal bone of the thumb near the palm. The abductor pollicis longus is innervated by the radial nerve and is supplied by branches of the radial artery. This muscle extends the thumb away from the hand. It also rotates and flexes the hand at the wrist. The combination of the abductor pollicis longus and the extensor pollicis brevis forms the oblique carpal muscle group.
Research Abductor Pollicis Longus
The deltoid is a large, thick powerful muscle with a triangular form and a coarse texture. The muscle is divided into three portions: an anterior (clavicular) portion, and acrominal portion, and a posterior portion. The anterior portion forms the broad side of the muscle and the posterior portion is located on the back of the shoulder. The muscle originates from the clavicle and from the spine of the scapula covering the outer side of the shoulder joint, giving the shoulder its rounded appearance, and inserts in the humerus. The deltoid is innervated by the 5th and 6th cervical nerves through the circumflex nerve and supplied by the circumflex artery.
Almost any movement of the shoulder and upper arm involves the deltoid muscle. The anterior portion is used to raise the arm from the body and to lower it again. The acrominal portion is a powerful abductor and the posterior portion is used to move the arm backward. It works with the pectoralis major to move the arm forward and works with the teres major and latissimus dorsi to move the arm back.
Research Deltoid
Combined with the abductor pollicis longus, the extensor pollicis brevis (thumb muscle) creates a narrow, triangular muscle form which wraps around the lower end of the radius (the bone of the forearm on the thumb side). The extensor pollicis brevis originates from the back side of the radius and inserts in the base of the first phalanx of the thumb. It is innervated by the radial nerve and supplied by the posterior interosseous artery. This muscle extends the thumb and continued action rotates the hand. The combination of the abductor pollicis longus and the
extensor pollicis brevis forms the oblique carpal muscle group.
Research Extensor Pollicis Brevis
The flexor digiti minimi brevis manus is a narrow muscle located between the abductor digiti minimi and the opponens digiti minimi. It originates from the flexor retinaculum and hamate bone and inserts in the proximal phalanx (first bone) of the little finger. It is innervated by the ulnar nerve and supplied by the ulnar artery. This muscle flexes the little finger. It is considered a part of the hypothenar eminence, the muscle mass of the little finger, located on the outside of the palm of the hand. The hypothenar eminence includes the abductor digiti minimi, the flexor digiti minimi brevis, the opponens digiti minimi, and the palmaris brevis. These muscles work together to perform the grasping functions of the hand.
Research Flexor Digiti Minimi Brevis Manus
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The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2009 The Probert Encyclopaedia
Southampton, United Kingdom
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