Muscle Atlas

Extensor Pollicis Brevis

Origin: Posterior surfaces of radius and interosseous membrane
Insertion: Base of proximal phalanx of thumb
Action: Extends proximal phalanx of thumb at carpometacarpal joint
Innervation: Posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve
Arterial Supply: Posterior interosseous artery

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