Abductor pollicis brevis muscle
|Abductor pollicis brevis muscle|
Superficial muscles of the left hand, palmar view.
|Origin||Transverse carpal ligament, the scaphoid and trapezium|
|Insertion||Radial base of proximal phalanx of thumb and the thumb extensors|
|Artery||Superficial palmar arch|
|Nerve||Recurrent branch of the median nerve|
|Actions||Abduction of the thumb by acting across the carpometacarpal joint and the metacarpophalangeal joint. It also assists in opposition and extension of the thumb.|
|Antagonist||Adductor pollicis muscle|
|Latin||musculus abductor pollicis brevis|
The abductor pollicis brevis is a muscle in the hand that functions as an abductor of the thumb.
The abductor pollicis brevis is innervated by the recurrent branch of the median nerve (Roots C5- C7 and C8-T1 in the brachial plexus lateral and medial cords respectively)
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.