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Extensor pollicis brevis muscle

Forearm muscle which moves the thumb

Field	Value
Name	Extensor pollicis brevis muscle
Latin	musculus extensor pollicis brevis
Image	Gray1231.png
Caption	Front of right upper extremity. (Extensor pollicis brevis labeled at upper left.)
Image2	Musculusextensorpollicisbrevis.png
Caption2	Posterior surface of the forearm. Deep muscles. (Extensor pollicis brevis visible at left.)
Origin	Radius and the Interosseous membrane
Insertion	Thumb, proximal phalanx
Action	Extension of thumb at metacarpophalangeal joint
Antagonist	Flexor pollicis longus muscle, flexor pollicis brevis muscle
Blood	Posterior interosseous artery
Nerve	Posterior interosseous nerve

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.

Structure

The extensor pollicis brevis arises from the ulna distal to the abductor pollicis longus, from the interosseous membrane, and from the dorsal surface of the radius.

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.

Variation

Absence; fusion of tendon with that of the extensor pollicis longus or abductor pollicis longus muscle.

Function

In a close relationship to the abductor pollicis longus, the extensor pollicis brevis both extends and abducts the thumb at the carpometacarpal and metacarpophalangeal joints.{{cite web | access-date =

Additional images

References

Sources

{{cite book | last = Platzer | first = Werner

References

{{harvnb. Platzer. 2004

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

muscles-of-the-upper-limb

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