Origin Posterior surface of middle 1/3 of ulna and interosseous membranee
Insertion Base of distal phalanx of thumb
Action Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints
Innervation Posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve (C7, C8)
Arterial Supply Posterior interosseous artery



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