Cellular Structure of the Human Cerebral Cortex by Constantin Von Economo

By Constantin Von Economo

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Section of the dome of a gyrus from the frontal lobe, showing the normal six-layered (hexalaminar) cortex. The white matter (Mark in German), which is devoid of nerve cells, is seen on the lower-right hand corner. I–VI, the six superimposed cortical cell layers. 50. 12 Fig. 3. Comparison of the cytoarchitectonic layers of cells (left) with the myeloarchitectonic arrangement of fibers (right) in the human cerebral cortex. The left field, after Brodmann [1909], shows the cellular structure in a Nissl-stained preparation.

Layer VI has an upper sublayer VIa and a lower sublayer VIb. In general, spindle (fusiform) cells are somewhat more orderly arranged than the pyramidal cells of layers III and V. The transition to the white matter is gradual, and the border imprecise. Giant Pyramidal Precentral Area FA␥ Area FA (including modification FA␥ ) coats the largest part of the precentral gyrus, commencing at its posterior boundary at the floor of the central sulcus of Rolando (fig. 1a, b); to be precise, it 35 reaches dorsally close to the superomedial hemispheric edge (fig.

The upper sublayer is more granular than the lower (better seen as Ia and Ib in fig. 12). Fig. 11. Giant pyramidal precentral area FA␥ (area EK 2). Caudal (posterior) brink of precentral gyrus, dorsal part. 45. Frontal Lobe 33 Fig. 12. Giant pyramidal precentral area FA␥ (area EK 2). Dome of paracentral lobule. 45. 34 Layer III essentially comprises five secondary sublayers: III(II), IIIa, IIIb, IIIc and III(IV). 5 mm in thickness, and its cells are not arranged in a very orderly fashion. Layer II is missing (fig.

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