Long extensor of the thumb of the hand
Long extensor of the thumb of the hand , m. Extensor pollicis longus, has a spindle-shaped abdomen and a long tendon. Lies next to the previous muscle; Begins from the interosseous membrane of the forearm, the interosseous edge and the back surface of the ulna and, going down, passes into the tendon that lies in the vagina of the tendon of the long extensor of the thumb of the hand, vagina tendinis m. Extensoris pollicis longi. Then, circling the first metacarpal bone and leaving on its rear surface, the tendon reaches the base of the distal phalanx, where it is attached.
Function: unbends the thumb of the hand and partially removes it.
Innervation: n. Radialis (СVI-СVIII).
Blood supply: a. Interossea posterior, a. Radialis.
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