The ulnar extensor of the wrist
The ulnar extensor of the wrist , m. Extensor carpi ulnaris, has a long spindle-shaped abdomen and is located along the inner edge of the dorsal surface of the forearm. The muscle begins with two heads - the humerus and the ulnar. The humeral head, caput humerale, originates from the lateral epicondyle of the humerus (somewhat higher than the attachment of M. extensoris digiti minimi), and the ulnar head, caput ulnare, - from the posterior edge of the ulnar body , at the level of the lower margin m. Anconei and elbow joint capsules. Both heads, moving into a short but powerful tendon, enclosed in the vulva of the tendon of the elbow extensor of the wrist, vagina tendinis m. Extensoris carpi ulnaris, attach to the base of the posterior surface of the metacarpal bone.
Function: pulls the brush to the elbow and unbends it.
Innervation: n. Radialis [(CVI) CVII-CVIII].
Blood supply: a. Interossea posterior.
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