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refers to one of two subdivisions of area 6 of Brodmann (guenon) defined on the basis of cytoarchitecture and myeloarechitecture. The other is area 6a of Vogts. They differ in that, whereas area 6a is agranular, i.e., lacks an internal granular layer (IV), area 6b is dysgranular. Each is further subdivided into two subareas which, for area 6b, are area 6b alpha of Vogts and area 6b beta of Vogts ( Vogts-1919 ).
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