Opponens pollicis
Hands
- Origin
- Flexor retinaculum and trapezium
- Insertion
- Thumb side of the first metacarpal
- Action
- Opposes the thumb (rolls it across the palm toward the fingers)
- Nerve supply
- Recurrent branch of the median nerve (C8–T1)
Lies under the abductor pollicis brevis. It rolls the thumb across the palm so its tip can meet the fingertips, the movement that makes precise pinching possible.
Opponens pollicis anatomy page →