The opponens pollicis is a thenar muscle located within the hand. It is the largest of the thenar muscles, and is located underneath the flexor pollcis brevis and abductor pollicis brevis.
- Attachments: Originates from the tubercle of the trapezium and the associated flexor retinaculum. Inserts onto the lateral margin of the first metacarpal.
- Actions: Opposition of the thumb
- Innervation: Median nerve (recurrent branch)
- Blood supply: Superficial palmar arch