Extensor Pollicis Longus



Tendons:

Origin: Middle third of posterior surface of the Ulna and the radioulnar interosseous membrane

Insertion: Dorsal base of the thumb Distal Phalanx through the Thumb extensor mechanism

Function: Extends the thumb Interphalangeal Joint

Nerve: Posterior Interosseous

Artery: Posterior Interosseous

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