Heterotypic cortex

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.[1]

References
  1. Brodmann K (1909). Beschreibung der einzelnen Hirnkarten IV. Kapitel in Vergleichende Lokalisationslehre der Grosshirnrinde [Localisation in the cerebral cortex : the principles of comparative localisation in the cerebral cortex based on the cytoarchitectonics] (in German). Leipzig: Verlag von Johann Ambrosias Barth. OCLC 310463543. (English translation available as OCLC 262025751)
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