Abductor pollicis brevis

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The abductor pollicis brevis is one of four lateral muscles of the hand, located on the radial side of the palm. It is an intrinsic hand muscle responsible for abduction of the thumb at the first carpometacarpal joint and first metacarpophalangeal joint. This muscle also contributes to the formation of the thenar eminence and is therefore classified as a thenar muscle.

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