heterotypic cortex

{{short description|Areas of the neocortex that do not have the typical six-layered structure}}

Heterotypic cortex consists of those areas of the mature neocortex that deviate markedly from the homogeneous six-layered internal structure seen in the third trimester of human gestation. A few neocortical areas, such as Brodmann area 17 and the granular insular cortex, undergo modification to more than six layers; and in a few areas, such as Brodmann area 4, the number of layers is reduced. Heterotypic cortex is contrasted to homotypic cortex, which retains the fetal six-layered pattern into adulthood. The number of heterotypic areas is small and the specific areas differ somewhat by species.{{cite book |author=Brodmann K |year=1909 |title=Beschreibung der einzelnen Hirnkarten IV. Kapitel in Vergleichende Lokalisationslehre der Grosshirnrinde |language=German |trans-title=Localisation in the cerebral cortex : the principles of comparative localisation in the cerebral cortex based on the cytoarchitectonics |publisher=Verlag von Johann Ambrosias Barth |location=Leipzig |oclc=310463543}} (English translation available as {{OCLC|262025751}})