part of olfactory bulb olfactory cortex BTO:0001446 BrendaTissueOBO That portion of the cerebral cortex that, with the palaeocortex, develops in association with the olfactory system, and which is phylogenetically older than the neocortex and lacks its layered structure. The embryonic archaeocortex corresponds to the cortex of the dentate gyrus and hippocampus in mature mammals. archaeocortex archeocortex archicortex archipallium