abductor pollicis brevis test

Abductor Pollicis Brevis Muscle Anatomy The abductor pollicis brevis is a flat, thin muscle located just under the skin. It is a thenar muscle and therefore contributes to the bulk of the palm’s thenar eminence. Origin It originates from the flexor retinaculum of the hand, the tubercle of the scaphoid bone, and additionally sometimes from…