Dictionary.net

This muscle arises, fleshy, from the anterior and inner part of the protuberance of the os calcis, and tendinous from the same bone where it joins with the os naviculare. It is inserted, tendinous, into the internal os sesamoideum and root of the first bone of the great toe. Use, to pull the great toe from the rest. The name Abductor has been given also to all those interosseous muscles of the hand and foot, which perform the motion of abduction on the fingers or toes, and to muscles which execute the same function on other parts of the body.