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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 Achilles Tendon is the tendon which connects the heel with the calf of the leg, and is the principal extensor of the foot.
Research Achilles Tendon
There are three dorsal metacarpal arteries lying toward the back of the hand and arising from the radial artery beneath the extensor tendons of the thumb. These arteries supply the back of the second, third, and fourth fingers.
Research Dorsal Metacarpal Arteries
An extensor is a muscle which serves to extend or straighten any part of the body, such as an arm or a finger.
Research Extensor
The extensor carpi radialis brevis is a short, wide, flattened muscle. It arises from the humerus and narrows into a long, flat tendon about two-thirds of the way down the arm. It lies between the extensor carpi radialis longus and the extensor digitorum along the outer surface of the radius. This muscle extends and radially deviates the hand at the wrist joint.
Research Extensor Carpi Radialis Brevis
The extensor carpi radialis longus is a short, flat muscle that originates from the supracondylar ridge of the humerus and extends down the arm. The muscle belly narrows into a long flat tendon at the upper third of the forearm and continues down to the outer edge of the radius and inserts in the posterior base of the second metacarpal bone. It is innervated by the radial nerve and supplied by the radial artery. This muscle helps to extend and radially deviate hand at the wrist. It also helps flex (bend) the elbow joint.
Research Extensor Carpi Radialis Longus
The extensor carpi ulnaris originates by two heads: one from the lateral epicondyle of the humerus and the other from the border of the ulna (forearm bone). It narrows into a tendon three-fourths of the way down the arm and inserts on the ulnar side of the base of the metacarpal bone of the little finger. It is innervated by the radial nerve and supplied by the posterior interosseous artery. This muscle is the most superficial muscle on the ulnar side of the forearm. The
extensor carpi ulnaris works with the flexor carpi ulnaris to bend the hand at the wrist.
Research Extensor Carpi Ulnaris
The extensor digiti minimi (extensor digiti quinti proprius) is a small, slender muscle that originates from the lateral epicondyle of the humerus , and lies between the extensor digitorum and the extensor carpi ulnaris. At the wrist, the muscle develops a double tendon which inserts into the last (distal) phalanx of the little finger. It is innervated by the radial nerve and is supplied by the posterior interosseous artery. This muscle is the predominant tendon of the little finger.
Research Extensor Digiti Minimi
The extensor digitorum (extensor digitorum communis) is a wide, lateral muscle. It has a flat, fusiform belly that originates from the lateral epicondyle of the humerus and extends towards the lower half of the forearm where it develops into four tendons that insert into the middle and distal phlanges of the fingers. It does not insert into the thumb. The
extensor digitorum is innervated by the radial nerve and supplied by the posterior interosseous artery. This muscle works to extend all the joints of the fingers. It also extends the wrist.
Research Extensor Digitorum
The extensor digitorum brevis originates from the front end of the calcaneum, the inferior extensor retinaculum, and the lateral talocalvaneal ligament. It is made up of four slender, flat bellies that pass over the top of the foot. Three of the bellies insert into tendons of the middle three toes. The most medial portion of the extensor digitorum brevis is also referred to as the extensor hallucis brevis. It inserts into the base of the first phalanx of the big toe. The
extensor digitorum brevis is innervated by deep branches of the peroneal nerves and supplied by the peroneal artery and the dorsal pedal artery. The muscles work to extend the big toe and the second, third, and fourth toes.
Research Extensor Digitorum Brevis
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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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Abbreviations
