Note that initially, each limb projects from the torso in a straight line. The cranial surface of each limb is designated the preaxial border. On the upper limb the thumb is on the preaxial border and on the lower limb, the great toe is on the preaxial border. The caudal surface of each limb is designated the postaxial border. The little finger and little toe would be on the post axial side of the limb.