The term marginal precentral sulcus refers to a superficial feature of the frontal lobe. It is a short horizontal groove found in 30% of human brains. Parallel to the longitudinal fissure, it is located within the superior frontal gyrus just anterior to the central sulcus and dorsal to the superior precentral sulcus ( Ono-1990 ). Equivalent features are not found in the macaque or in the smooth cerebral cortex of the rat or mouse ( NeuroNames ).