Extensor pollicis brevis muscle
| Extensor pollicis brevis muscle | |
|---|---|
Front of right upper extremity. (Extensor pollicis brevis labeled at upper left.) | |
Posterior surface of the forearm. Deep muscles. (Extensor pollicis brevis visible at left.) | |
| Details | |
| Origin | Radius and the Interosseous membrane |
| Insertion | Thumb, proximal phalanx |
| Artery | Posterior interosseous artery |
| Nerve | Posterior interosseous nerve |
| Actions | Extension of thumb at metacarpophalangeal joint |
| Antagonist | Flexor pollicis longus muscle, flexor pollicis brevis muscle |
| Identifiers | |
| Latin | musculus extensor pollicis brevis |
| TA98 | A04.6.02.050 |
| TA2 | 2518 |
| FMA | 38518 |
| Anatomical terms of muscle | |
In human anatomy, the extensor pollicis brevis (EPB) is a skeletal muscle on the dorsal side of the forearm. It lies on the medial side of, and is closely connected with, the abductor pollicis longus. The extensor pollicis brevis belongs to the deep group of the posterior fascial compartment of the forearm. It is a part of the lateral border of the anatomical snuffbox.