Terminology Tools A B Origin begining site of the more fixed end or attachment of the muscle Insertion site of attachment of a muscle to the bone and/or tissue which it moves Superior toward the head; toward the upper part of the (cranial) structure Inferior away from the head; toward the lower part of the (caudal) structure Anterior nearer to or at the front of the body. (ventral) Posterior nearer to or at the back of the body. Doral top of the foot Medial nearer the midline of the body Lateral farther from the midline of the body Proximal nearer the attachment of a limb to the trunk Distal away from the attachment of a limb to the trunk External toward the surface of the body. (superficial) Internal away from the surface of the body. (deep) Plantar the sole or towards the sole of the foot