Extensor Pollicis Brevis


Origin: Posterior surface of the Radius and the radioulnar interosseous membrane

Insertion: Dorsal base of the thumb proximal plalanx

Function: Extends the thumb MCP joint and weakly abducts the thumb basal joint, along with other muscles which produce radial and palmar abduction

Nerve: Posterior interosseous

Artery: Posterior interosseous

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