Abductor Pollicis Longus
- Abducts thumb and extends it at carpometacarpal joint.
- Posterior surfaces of ulna, radius and interosseous membrane.
- Base of 1st metacarpal.
- Posterior interosseous nerve (C7 and C8).
- The continuation of the deep branch of the radial nerve.
Arterial Supply :
- Posterior interosseous artery.