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refers to a subdivision of area 8 of Brodmann (guenon). It is one of 4 parts of area 8 that differ in cytoarchitecture and myeloarchitecture. It differs from area 8 gamma of Vogts in that the external pyramidal layer (III) is narrower, the cell density of the internal granular layer (IV) is less, and the cellular sublayer of the internal pyramidal layer (V) is narrower, less cellular and less distinct. The other subdivisions of area 8 are area 8 alpha of Vogts, area 8 gamma of Vogts, and area 8 delta of Vogts ( Vogts-1919 ).
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