Muscle, abductor pollicis, short (M. Abductor Pollicis Brevis, Pna, Bna, Jna)

The abductor pollicis brevis muscle (lat. Musculus abductor pollicis brevis) is a small muscle of the forearm, part of the lateral interosseous nerve, innervated by the ulnar nerve.

The muscle begins on the lateral surface of the pisiform bone, at the level of the pisioclavicular joint, and is attached to the base of the thumb, between its base and the first metacarpal bone.

Function: moves the thumb away from the other fingers of the hand.

The human fingers consist of 5 phalanges (phalanxes are skeletal structures), three of which form the fingers, and the remaining two form the palm. The hands contain many different muscles. One of the most important elements in humans is the abductor pollicis muscle and the short leg muscle of the thumb.