Extensor pollicis brevis muscle

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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.)
Latin musculus extensor pollicis brevis
Gray's subject #125 455
Origin: radius
Insertion: thumb, proximal phalanx
Artery: posterior interosseous artery
Nerve: posterior interosseous nerve
Action: extension of thumb at metacarpophalangeal joint
Antagonist: Flexor pollicis longus muscle, Flexor pollicis brevis muscle
Dorlands/Elsevier m_22/12548946

The Extensor pollicis brevis lies on the medial side of, and is closely connected with, the Abductor pollicis longus.

Origin and insertion

It arises from the dorsal surface of the body of the radius below that muscle, and from the interosseous membrane.

Its direction is similar to that of the Abductor pollicis longus, its tendon passing the same groove on the lateral side of the lower end of the radius, to be inserted into the base of the first phalanx of the thumb.


The Extensor pollicis brevis extends the proximal phalanx.


Absence; fusion of tendon with that of the Extensor pollicis longus.

Additional images

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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