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)


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