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refers to a subdivision of the cerebral cortex of the monkey (Macaca) based on cytoarchitecture. Located in the ventral portion of the supramarginal gyrus and postcentral gyrus, particularly in the dorsal bank of the lateral fissure, it was regarded by Roberts and Akert as corresponding to the area defined electrophysiologically by Woolsey and Fairman in 1946 as the area SII of Woolsey. The cortex is relatively thick; the external granular layer (II) and internal pyramidal layer (V) form dark bands due high cell density; the external pyramidal layer (III) is more differentiated than in rostral parts of the postcentral gyrus and shows a gradient of cell sizes from smaller to larger going from superficial to deeper levels; the internal granular layer (IV) is visible but not well developed; the internal pyramidal layer (V) contains small and medium sized cells and no giant pyramidal cells; the multiform layer (VI) has two distinct sublayers but a less distinct boundary with the subcortical white matter ( Roberts-1963 ).
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