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Extensor Pollicis Brevis (EPB)
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Extensor Pollicis Brevis (EPB):
Proximal Attachment - Posterior surface of distal third of radius and interosseous membrane
Distal Attachment - Dorsal aspect of base of proximal phalanx of thumb
Innervation - Posterior interosseous nerve, continuation of deep branch of radial nerve
Action - Extends proximal phalanx of thumb at metacarpophalangeal joint; extends carpometacarpal joint