The term paleocortex - obsolete represents a type of cerebral cortex defined on the basis of cytoarchitecture. The now obsolete definition differed from the definition that has become accepted since Stephan proposed it in the 1970s ( Stephan-1975: Zilles-1990; Paxinos-2004 ). Unlike the new definition, the old definition did not include the olfactory bulb and the accessory olfactory bulb as paleocortical structures. For the current definition see paleocortex.