. A treatise on nervous and mental diseases, for students and practitioners of medicine. d inclusters or nests. Betz first suggested their probable motor believes that the large size of these cells is due to the dis-tance which their apex process has to transverse in attaining theouter layer of the cortex; but Bevan Lewis has shown that evenlarger cells are found nearer the upper surface of the cortex, so thatthis argument falls to the ground. Into this region of the brain cells of the gray matter ascend themedullated nerve fibres from the sub-lying nervous regions, as rep-res
. A treatise on nervous and mental diseases, for students and practitioners of medicine. d inclusters or nests. Betz first suggested their probable motor believes that the large size of these cells is due to the dis-tance which their apex process has to transverse in attaining theouter layer of the cortex; but Bevan Lewis has shown that evenlarger cells are found nearer the upper surface of the cortex, so thatthis argument falls to the ground. Into this region of the brain cells of the gray matter ascend themedullated nerve fibres from the sub-lying nervous regions, as rep-resented in Fig. 13, which is drawn from a microscopic section of aconvolution, and in which the nerve fibres are seen coming up in asheath or bundle and diverging gracefully to penetrate the graymatter. These various convolutions of the brain are connected by commis- 32 INTRODUCTORY. sural or connecting fibres. Although the latter have been describedby Meynert, Burdach, and Stilling, who have managed to tear brainsin a peculiar manner by various methods of hardening, yet these Fig. Drawing from secMon magnified diameters, showing the nerve fibres i^assiug into a convolution. Fig. 14.
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