paleopallium

noun
pa·​leo·​pal·​li·​um
variants: or British palaeopallium \ -​ˈpal-​ē-​əm How to pronounce palaeopallium (audio) \
plural paleopallia\ -​ē-​ə How to pronounce paleopallia (audio) \ or paleopalliums

Medical Definition of paleopallium

: a phylogenetically old part of the cerebral cortex that develops along the lateral aspect of the hemispheres and gives rise to the olfactory lobes in higher forms