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refers to a cortical area in the postcentral gyrus defined on the basis of cytoarchitecture in the rhesus macaque (Macaca mulatta). The author regarded it as the same as area 3 of Brodmann (guenon). Cortical thickness was 1.08 mm. The molecular layer of the cerebral cortex (I) contained few cells, with about equal numbers of granular cells and spindle cells. The external granular layer (II) was about 12 cells deep with small and medium sized granule cells densely grouped; an occasional small pyramidal cell was seen deep in the layer. Cells in the external pyramidal layer (III) were densely and irregularly arranged; most were small or medium in size with a few larger cells scattered on both sides of the boundary with the next layer. The internal granular layer (IV) was composed of very small granular cells, loosely packed, and was about 12 cells deep. The internal pyramidal layer (V) consisted of two loosely arranged sublayers, an outer sublayer of cells of medium size and an inner sublayer containing groups of larger pyramidal cells. Its boundary with the multiform layer (VI), a narrow zone of medium sized spindle cells, was indistinct and contained a few small pyramidal cells ( Peele-1942 ).
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