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refers to one of three types of allocortex defined on the basis of cytoarchitecture. The other two are archicortex and periallocortex. It consists of very thin, primitive cortex with few clearly defined layers. It is distinguished developmentally by the fact that it does not develop through the cortical plate. It includes the olfactory bulb, accessory olfactory bulb, olfactory tubercle, septum, piriform area and periamygdalar area ( Stephan-1975 ). It differs from earlier definitions in that it includes the olfactory bulb and accessory olfactory bulb, which were once not recognized to be cortical structures. It constitutes less than 1% of the surface area of the cerebral cortex ( Stephan-1975, Zilles-1990 ).
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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.
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