paleocortex

noun
pa·​leo·​cor·​tex
variants: or British palaeocortex \ -​ˈkȯr-​ˌteks How to pronounce palaeocortex (audio) \
plural paleocortices\ -​ˈkȯrt-​ə-​ˌsēz How to pronounce paleocortices (audio) \ or paleocortexes

Medical Definition of paleocortex

: the part of the cerebral cortex that is evolutionarily older than the neocortex and that is composed especially of the olfactory cortex