allocortex
n. those regions of the cerebral cortex that are phylogenetically older and have fewer than six main layers of cells. The allocortex is involved primarily in olfactory functions and limbic functions related to memory and emotion, and it comprises the three-layered archicortex (or archipallium), found mostly in the hippocampus, and the four- or five-layered paleocortex (or paleopallium), found mostly in the pyriform area and parahippocampal gyrus. Compare neocortex.