. L'anatomie comparée des animaux domestiques. Anatomie vétérinaire. Le cerveau. 795 au milieu de chaque hémisphère, la substance blanche constitue une considération- mesure noyau, qui, de sa forme, est nommé le centrum ovale (Vicq-d'Azyr) (Fig. 427, 1 ; 434, 1), et qui est unie à celle de l'autre côté par la grande commissure cérébrale, ou corps calleux, l'envoi d'une prolongation dans chaque produit de convolution ; ainsi exposer la disposition exacte des masses blanc latéral du cervelet, avec laquelle les noyaux des hémisphères ont aussi un autre point de ressemblance, en ce qu'ils

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. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE CEREBRUM. 795 In the middle of each hemisphere, the white substance constitutes a consider- able nucleus, which, from its form, is named the centrum ovale (Vicq-d'Azyr) (Fig. 427, 1 ; 434, 1), and which is united to that of the opposite side by the great cerebral commissure, or corpus callosum, sending a prolongation into each convolution ; thus exhibiting the exact disposition of the lateral white masses of the cerebellum, with which the nuclei of the hemispheres have also another point of resemblance, in that they are attached to the cerebral peduncles, as the first are to the cerebellar. But the latter peculiarity is less evident than the others— which are at once obvious in horizontal and transverse sections of the brain— and can only be clearly demonstrated by the manipulations necessary to unravel the intimate texture of the white substance. In studying this texture in brains hardened by nitric acid, washed in pure water, and exposed to dry air for a day or two, we perceive that the white cerebral substance is entirely composed of fine fibrous lamellae, diverging in every Fig. 438. Fi£r. 439.. DIAGRAM OF THE COURSE OF THE ASSOCIATION NERVE-FIBRES OF THE CORPUS CALLOSUM AND OF THE ANTERIOR COMMISSURE. DIAGRAM OF THE COURSE OF THE RADIAT- ING NERVE-FIBRES OF THE CORONA RADIATA, AND THE RELATIONS OF THE CORPORA STRIATA WITH THE CORTICAL GREY SUBSTANCE. direction, corresponding by their concentric extremity to the centre of the hemisphere, and abutting, by their peripheral extremity, on the inner face of the grey covering of the convolutions. With regard to the relations between the centrum ovale and the cerebral isthmus, and those the fibres of the former have with the other parts of the brain, it is found that the fibres of the lower stage of the peduncles attach the isthmus to the cerebral hemispheres, in passing through the corpora striata, and radiate in the centrum ovale. Her

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