| Extensor pollicis longus muscle | |
|---|---|
 Posterior surface of the forearm. Deep muscles. Extensor pollicis longus muscle is labeled in purple. | |
| Details | |
| Origin | Middle third of posterior surface of ulna, interosseous membrane |
| Insertion | Thumb, distal phalanx |
| Artery | Posterior interosseous artery |
| Nerve | Posterior interosseous nerve (branching from the radial nerve) |
| Actions | Extension of the thumb (metacarpophalangeal and interphalangeal) |
| Antagonist | Flexor pollicis longus muscle, flexor pollicis brevis muscle |
| Identifiers | |
| Latin | musculus extensor pollicis longus |
| TA98 | A04.6.02.051 |
| TA2 | 2516 |
| FMA | 38521 |
| Anatomical terms of muscle | |
In human anatomy, the extensor pollicis longus muscle (EPL) is a skeletal muscle located dorsally on the forearm. It is much larger than the extensor pollicis brevis, the origin of which it partly covers and acts to stretch the thumb together with this muscle.