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refers to a subdivision of area 9 of Brodmann (guenon) based on cytoarchitecture and myeloarchitecture. It is one of four parts of area 9. The others are area 9b of Vogts, area 9c of Vogts and area 9d of Vogts. Its rostral boundary is not completely delineated in the cortical diagram of Vogts\' areas. In contrast to area 4a of Vogts, area 9a is thin, has a lightly developed internal granular layer (IV), and has an internal pyramidal layer (V) in which the sublayer Va is narrower and the sublayer Vb wider ( Vogts-1919 ).
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