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