Extensor pollicis brevis

The extensor pollicis brevis muscle is located on the dorsal side of the forearm. Originating from the trapezium and the flexor retinaculum, it is connected with the extensor pollicis longus to make up the interosseous membrane. It is inserted at the base of the proximal phalanx of the thumb and forms the radial side of the anatomical snuff box at the wrist. Along with the extensor pollicis longus, the functions of the extensor pollicis brevis include extending the metacarpophalangeal joint of the thumb, extending the wrist, and extending and abducting the fingers. It gets its nerve supply from the median nerve and its arterial supply from the posterior interosseous artery. The daily extension of the wrist and the adduction and flexion of the fingers gather their abilities from the abundance of i fibers found in the extensor pollicis brevis, meaning short extensor of the thumb, and the extensor pollicis longus, meaning the long extensor of the thumb, and from the connective tissues filled with collagen.
Written and medically reviewed by the Healthline Editorial Team
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In Depth: Extensor pollicis brevis

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