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
OriginRadius and the Interosseous membrane
InsertionThumb, proximal phalanx
ArteryPosterior interosseous artery
NervePosterior interosseous nerve
ActionsExtension of thumb at metacarpophalangeal joint
AntagonistFlexor pollicis longus muscle, flexor pollicis brevis muscle
Identifiers
Latinmusculus extensor pollicis brevis
TA98A04.6.02.050
TA22518
FMA38518
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.