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Extensor Pollicis Longus
Region: Forearm & Hand Muscles · All forearm & hand muscles
Extensor Pollicis Longus at a glance
| Origin | Back surface of the ulna and the interosseous membrane |
|---|---|
| Insertion | Base of the distal phalanx of the thumb |
| Actions | Straightens the thumb tip; Pulls the thumb back in line with the hand (reposition) |
| Nerve supply | Posterior interosseous nerve (C7–C8) |
◆ Good to know
Its tendon hooks around the dorsal tubercle of the radius (Lister's tubercle) and forms the back border of the snuffbox; it can rupture after distal radius fractures.
More Forearm & Hand Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.