The term lateral orbital gyrus (ORGl) refers to a convolution identified by dissection on the ventral aspect of the frontal lobe (FLB) in the human and the macaque. In the human, it is partially separated laterally from the orbital part of the inferior frontal gyrus (IFGor) by an unnamed sulcus ( Mai-1997 ) and medially from the intermediate orbital gyrus (ORGim) by the lateral orbital sulcus (los). Rostrally it merges with the frontomarginal gyrus (ORGfm) and caudally with the insula ( Mai-1997 ). In the macaque, and in some sources, the part that extends caudally to the insula is called the fronto-orbital gyrus ( Krieg-1975, Martin-2000, Dubach-2008 ). Equivalent features are not seen in the smooth cerebral cortex of the rat and mouse ( NeuroNames ).