The abductor pollicis brevis is a thenar muscle located within the hand. It forms the anterolateral aspect of the thenar eminence, overlying the opponens pollicis.
- Attachments: Originates from the tubercles of the scaphoid and trapezium and from the associated flexor retinaculum. Attaches to lateral aspect of the proximal phalanx of the thumb.
- Actions: Abduction of the thumb.
- Innervation: Median nerve (recurrent branch)
- Blood supply: Superficial palmar arch