The term periamygdalar region (par) refers to a surface feature of structures overlying the amygdala on the mesioventral surface of the cerebral hemisphere. In humans and macaques it overlies parts of the anterior parahippocampal gyrus (PHGa) of the limbic lobe (LLB) ( Carpenter-1983 ). Those structures, listed roughly from dorsal to ventral and rostral to caudal, include the piriform cortex (PIR), corticoamygdalar area (CAA), anterior periamygdalar cortex (COA), posterior parahippocampal cortex (