The term area 12r (macaque) refers to a portion of the orbital gyri that is defined on the basis of internal structure in the macaque. It is one of four components of area 12 in the orbitomedial prefrontal cortex. The other components are area 12m (macaque), area 12o (macaque), and area 12l (macaque) ( Carmichael-1994 ). Some authors divide area 12 into only two parts, an orbital part and a lateral part ( Paxinos-2009a ). Its human equivalent is area 47/12r ( Ongur-2003 ). As granular prefrontal cortex, it has no equivalent in the rat ( Wallis-2012 ).