?:definition
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refers to an area located on the posterior \'\'lip\'\' of the middle frontal gyrus that was defined on the basis of cytoarchitecture in the guenon. In comparison with area 8 of Brodmann (guenon), area 8a showed more pronounced layers of large pyramidal cells (layer IIIb in the external pyramidal layer (III)) and of ganglion cells in the internal pyramidal layer (V); the internal granular layer (IV) was less pronounced. The internal structure of the area was illustrated in Brodmann-1905. It was not mentioned or illustrated in the map of Brodmann\'s areas in Brodmann-1909.
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