Extensor pollicis brevis muscle

Extensor pollicis brevis muscle is a muscle in the forearm that extends the thumb. It is shorter than the extensor pollicis longus, another muscle that also extends the thumb.

Etymology

The term "extensor pollicis brevis" is derived from Latin, with "extensor" meaning "to extend", "pollicis" referring to "thumb", and "brevis" meaning "short".

Structure

The extensor pollicis brevis muscle originates from the radius and the interosseous membrane. It runs through the third tendon compartment together with the extensor pollicis longus muscle. Its tendon inserts into the base of the proximal phalanx of the thumb.

Function

The extensor pollicis brevis muscle, along with the extensor pollicis longus muscle, helps to extend the thumb. It also assists in the abduction of the thumb.

Clinical significance

Injury to the extensor pollicis brevis muscle can result in a condition known as De Quervain's tenosynovitis, which is characterized by pain and swelling in the wrist and thumb.

See also

• List of muscles of the human body
• Extensor pollicis longus muscle
• De Quervain's tenosynovitis

References

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