The term area 8 alpha of Vogts 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 beta of Vogts in that the external granular layer (II), the external pyramidal layer (III), the internal granular layer (IV) and the internal pyramidal layer (V) are all narrower. Layer V, particularly the sublayer b, is dominated by large pyramidal cells. Sublayer b of the multiform layer (VI) is very wide and its boundary with the subcortical white matter is not distinct. The other subdivisions of area 8 are area 8 beta of Vogts, area 8 gamma of Vogts, and area 8 delta of Vogts ( Vogts-1919 ).