The long flexor of the thumb of the hand
The long flexor of the thumb of the hand , m. Flexor pollicis longus, looks like a long, single-leaved flat muscle lying on the lateral edge of the forearm. It starts from the upper 2/3 of the front surface of the radial bone body and the interosseous membrane of the forearm, from the medial epicondyle of the humerus. The muscle passes into a long tendon, which, going downwards, lies in the carpal tunnel, and then is surrounded by the tendon of the long flexor of the thumb of the hand, vagina tendinis m. Flexoris pollici longi, and, reaching the distal phalanx, is attached to its base.
Function: folds the distal phalanx of the thumb.
Innervation: n. Medianus (CVI-CVIII).
Blood supply: aa. Radialis, ulnaris, a. Interossea anterior.
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