extensor pollicis brevis muscle
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Extensor pollicis brevis muscle

What is Extensor pollicis brevis muscle? The extensor pollicis brevis muscle is a skeletal muscle located in the forearm that is responsible for extending the thumb at the carpometacarpal joint (base of the thumb). It originates from the distal third of the posterior surface of the ulna bone and the interosseous membrane, and inserts into…