. A treatise on nervous and mental diseases, for students and practitioners of medicine. 17. Transverse stratum of cuneus. 18. Stratum proprium ofcuneus. 19. Stratum proprium of parietal fissure. 20. Stratum proprium of firstoccipital fissure. 21. Stratum proprium of second occipital fissure. 22. Stratum pro-prium of the collateral sulcus. Deep stratum of convexity. observation, as lesions in the different lobes of the brain have beenquite sufficient to cause marked meutal symptoms. We are therefore ANATOMY. 35 warranted iii regarding the cortex, as a whole, as the organ of themind, and t
. A treatise on nervous and mental diseases, for students and practitioners of medicine. 17. Transverse stratum of cuneus. 18. Stratum proprium ofcuneus. 19. Stratum proprium of parietal fissure. 20. Stratum proprium of firstoccipital fissure. 21. Stratum proprium of second occipital fissure. 22. Stratum pro-prium of the collateral sulcus. Deep stratum of convexity. observation, as lesions in the different lobes of the brain have beenquite sufficient to cause marked meutal symptoms. We are therefore ANATOMY. 35 warranted iii regarding the cortex, as a whole, as the organ of themind, and the so-called centres as being those areas of the cortex inwhich terminate the nerves coming from the periphery, or what areknown as the projection fibres, in contradistinction to the commis-sural fibres of the cerebrum, which, as we have seen, connect thedifferent convolutions. It will now be our task to travel the highly complex route whichthese projection fibres take from the cortex to the peripheral struc-tures, although it must be borne in mind that in doing this we can Fig. ] Photograph of section of the cerebrum, showing the centrum ovale on the left side. no more than outline the anatomical facts which have a clinicalbearing. Fig. 17 represents upon the left side a transverse sectionmade across the hemisphere a short distance below the vertex, andshows the centrum ovale, consisting of the white matter in the centrefringed around with the convolutions. Fig. 18 represents a stilldeeper section of the liemisphere, showing in the middle line thegreat mass of commissural or connecting fibres running across fromone hemisphere to the other, the so-called corpus callosum. Whenthis corpus callosum is lifted (Fig. 19) the ganglia of the base, or thehanal rjanglia, are seen lying in the ventricles, the third ventricle inthe centre and the lateral ventricles one on each side. These basal 36 INTRODUCTORY, ganglia consist of several masses of gray matter. On each side ofthe median
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