The term amygdalohippocampal area refers to a histologically defined part of the amygdala (MG). All authors regard it as occupying the caudal third of the AMG, which abuts the hippocampal complex (HPC). In the human ( Mai-1997 ) and the macaque ( Amaral-1992 ) it is located close to the medial surface of the ventroanterior limbic lobe (LLB). It is bounded internally by the posterior periamygdalar cortex (COAp) and the temporal horn of the lateral ventricle. In the rat ( Swanson-2004 ) and mouse ( Hof-2000 ,) it is bounded largely by the COAp and the accessory basal nucleus (known as the basomedial nucleus of the amygdala in rodents); the stria terminalis separates it from the ventricle. According to some authors the amygdalohippocampal area extends anteriorly to occupy the caudal half of the amygdala. These authors divide the area into two or three parts, which in the human ( Olmos-2004 ), the rat ( Paxinos-2009b ), and the mouse ( Franklin-2008 ) are named on the basis of location: anterolateral, posterolateral and posteromedial parts. In the macaque ( Paxinos-2009a ) the rostral portion of the area is divided into two parts on the basis of cellular morphology: magnocellular and parvicellular parts. Some authors refer to the area in rodents as the 'posterior periamygdalar cortex' ( Swanson-2004; Hof-2000 ).