Abductor pollicis brevis

The abductor pollicis brevis (or abductor pollicis brevis muscle, latin: musculus abductor pollicis brevis) is one of the four muscles of the thumb (also known as thenar muscles) located on the radial side of the palm.

Origin

The abductor pollicis brevis originates from the flexor retinaculum and from the tubercles of the scaphoid and trapezoid bones.

Insertion

The abductor pollicis brevis passes forward and reaching the proximal phalanx of the thumb inserts onto the lateral side of its base.

Action

The main function of the abductor pollicis brevis is to abduct the thumb.

Innervation

The abductor pollicis brevis is innervated by the median nerve.