Extensor Pollicis Longus and Brevis

Extensor Pollicis Longus

Origin: Posterior surface of the Ulna

Insertion: distal phalanx of thumb

Action: Extends distal phalanx of thumb

 

Extensor Pollicis Brevis

Origin: Posterior surface of radius

Insertion: Proximal phalanx of thumb

Action: Extends proximal phalanx of thumb

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