Mental protuberance
The symphysis of the external surface of the mandible divides below and encloses a triangular eminence, the mental protuberance, the base of which is depressed in the center but raised on either side to form the "mental tubercle". The size and shape of the bones making up this structure are responsible for the size and shape of a person's chin. Synonyms of "mental protuberance" include "mental process" and "protuberantia mentalis." "Mental" in this sense derives from Latin "mentum" (chin), not "mens" (mind), source of the more common meaning of "mental".