Muscle Atlas

Extensor Pollicis Longus

Origin: Posterior surface of middle 1/3 of ulna and interosseous membrane
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
Arterial Supply: Posterior interosseous artery

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