. Die cyclopaedia von Anatomie und Physiologie. Anatomie, Physiologie, Zoologie. 694 NERVENSYSTEM. (Nervöse Zentren. Hirn.) Oberflächen waren gleich, weder von Ihnen in Falten geworfen werden würde. Inexaminingthesurfacecalled centrum Samenanlage, die durch einen horizontalen Schnitt durch die Hemisphäre über dem Niveau des Corpus callosum ausgesetzt ist, erhalten wir eine Erklärung für die Entstehung der gewundene Oberfläche des Gehirns. Die Ebene des faserigen Sache wird durch eine wellige Marge von vesikulären Materie umgeben, die Faltungen von denen der gewundenen Aussehen der zerebralen Oberfläche geben. Die

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 694 NERVOUS SYSTEM. (NERVOUS CENTRES. THE ENCEPHALON.) surfaces were equal, neither of them would be thrown into folds. Inexaminingthesurfacecalled centrum ovule, which is exposed by a horizontal section through the hemisphere above the level of the corpus callosum, we obtain an explanation of the formation of the convoluted surface of the brain. That plane of fibrous matter is surrounded by an undulating margin of vesicular matter, the foldings of which give rise to the convoluted appearance of the cerebral surface. The fibrous matter is adapted to this irregular surface, not by any similar folding, but by the prolongation of its fibres into the concavities of the folds. It is only by means of these prolongations that an equality obtains between the surface of grey matter and that of fibrous matter which it covers. In brains devoid of convolutions, the vesicular and fibrous surfaces are applied to each other as two layers disposed in con- centric circles. There are no irregularities in either one or the other. But any increase in the extent of the grey surface involves a cor- responding complication in that of the fibrous matter, which is effected by the prolongation of the fibres at certain situations. Were we to suppose two brains in which the quantity of fibrous matter in the hemispheres was equal, the quantity of grey matter in one might be increased considerably, and therefore become convoluted without involving any other altera- tion in the fibrous matter than the elongation of certain bundles of fibres at particular situations. The existence of convolutions on the surface of the hemispheres, as contrasted with the ab- sence of them, indicates an increase in the de- velopement of the dynamic matter. A convo- luted brain, even although actually smaller than one with a smooth surface, would yet in- dicate a higher degree of mental power, inas- much as it possesses a larger quantity of th

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• booksubjectanatomy
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