| The term external orbital area 10 (M) refers to a subdivision of the frontal lobe of the monkey (guenon) defined on the basis of cytoarchitecture. Brodmann-09 did not regard it as cytoarchitecturally homologous to his human frontopolar area 10. Distinctive features (Brodmann-05): compared to granular frontal area 9, the multiform layer (VI) of area 10 shows an unusual a organization of cells into trains oriented parallel to the cortical surface that are separated from one another by narrow cell-free fiber bundles; less marked differences are an overall thinner cortical thickness and a somewhat thicker molecular layer (I). Compared to area 6 of Brodmann, area 10 has a subtle but clearly present internal granular layer (IV); layer 3b of the of the external pyramidal layer (III) is weakly developed and composed of medium sized pyramidal cells; and the internal pyramidal layer (V) is more developed. |
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