The abductor pollicis brevis is an abductor of the thumb.
It is a thenar muscle, and therefore contributes to the bulk of the palm’s thenar eminence.
It originates from the flexor retinaculum of the hand, the tubercle of the scaphoid bone, and additionally sometimes from the tubercle of the trapezium.
Running lateralward and downward, it is inserted by a thin, flat tendon into the lateral side of the base of the first phalanx of the thumb and the capsule of the metacarpophalangeal joint.
It is supplied by median nerve. C8/T1
This muscle is abductor of the thumb. It also assists in opposition and extension of the thumb.« Back to Glossary Index