paleocortex

noun
pa·leo·cor·tex
variants: or British palaeocortex \-ˈkȯr-ˌteks \
plural paleocortices\-ˈkȯrt-ə-ˌsēz \ 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

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