Toward the midline. This word is used when an organism is in anatomic position and it is necessary to describe a feature on its body so that others can understand without actually seeing the organism where something is in reference to something else. The right eye is medial to the right ear.

Also see superior, posterior, ventral, dorsal, cephalic, caudal, proximal, distal, lateral, superficial, deep, prone, supine, plane, and region.