Abductor pollicis brevis muscle
|Abductor pollicis brevis muscle|
|Abductor pollicis brevis visible at center right.|
|The mucous sheaths of the tendons on the back of the wrist. (Abductor pollicis longus and brevis visible at center right, going into thumb.)|
|Latin||musculus abductor pollicis brevis|
|Gray's||subject #126 461|
|Origin:||Transverse carpal ligament, the scaphoid and trapezium |
|Insertion:||Radial base of proximal phalanx of thumb and the thumb extensors |
|Antagonist:||Adductor pollicis muscle|
The abductor pollicis brevis is a muscle in the hand that functions as an abductor of the thumb.
Abduction of the thumb is defined as the movement of the thumb anteriorly, a direction perpendicular to the palm. The abductor pollicis brevis does this by acting across both the carpometacarpal joint and the metacarpophalangeal joint.
It also assists in opposition and extension of the thumb.
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 As such, some of the information contained herein may be outdated.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.