Extensor Pollicis Brevis

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Distal attachment of extensor pollicus brevis

Dorsal aspect of base of proximal phalanx of thumb

Action of extensor pollicus brevis

Extends proximal phalanx of thumb at metacarpophalangeal joint Extends carpometacarpal joint

Innervation of extensor pollicus brevis

Posterior interosseous nerve Continuation of deep branch of radial nerve

Proximal attachment of extensor pollicus brevis

Posterior surface of distal third of radius and interosseous membrane


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