Cellular Structure of the Human Cerebral Cortex by Constantin Von Economo

By Constantin Von Economo

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Introduction Fig. 10. Changing thickness of layers I–VI at the dome, brink (edge), wall, and valley (sulcus floor) of a gyrus. The two granular layers (external and internal) are hatched; wm, subcortical white matter. Such relations are best exemplified in table 4, which gives measurements of the cortical thickness at the dome, wall and valley floor in a small precentral gyrus, along with the values for each individual layer. The numbers further permit a calculation of the proportion taken by each layer at the dome, wall and valley for the sake of comparison (table 4).

11). The granulous type (cortical structural type 5) is the result of an opposite process (fig. 8). In contrast to the usual type of granular cortex, not only do layers II and IV contain large numbers of granule-sized cells, but the other layers contain similar small cells as well, in densities and numbers that bolster them into also being called granular layers. Such a change usually involves layer III in its entirety or in part, and occasionally layers V or VI. Those layers can be hardly distinguished from the regular granular layers (II and a b Fig.

They are round or polygonal, often triangular, with a very scanty cytoplasm, as the nucleus occupies most of the cell. Conventional staining 11 Fig. 2. 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.

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