Summary Abductor Pollicis Longus Origin Posterior surfaces of ulna, radius and interosseous membrane Insertion Base of 1st metacarpal Action Abducts thumb and extends it at carpometacarpal joint Innervation Posterior interosseous nerve (C7, C8) Arterial Supply Posterior interosseous artery
Abductor Pollicis Longus summary OBC What is the origin? Origin Posterior surfaces of ulna, radius and interosseous membrane Show Bullets