Anatomy - Extensor pollicis longus muscle
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Extensor pollicis longus - Insertion
Base of the distal phalanx of the thumb (dorsal surface)
Extensor pollicis longus - Action
Extension of the thumb at the carpometacarpal, metacarpophalangeal, and interphalangeal joints, Extension of the wrist, Abduction of the wrist, Weak supination of the forearm from a pronated position
Extensor pollicis longus - Origin
Posterior lateral surface of the lower middle ulna
Extensor pollicis longus - Innervation
Radial nerve (C6-C8)
