The term frontal operculum (Krieg) refers to the most rostral of three parts of the frontoparietal operculum as defined for the human in Duvernoy-1992 and for the macaque in Krieg-1975. In the human it is the same as the frontal operculum except that it does not include the precentral operculum. In the macaque it is the same except that it only includes the most rostral part of the precentral operculum. The other parts are the subcentral operculum and the parietal operculum (Krieg). It is not present in rodents.