A text-book of physiology, for medical students and physicians . ion have been strengthened by the results of com-parative anatomy and especially by the effects of ablation ofdefinite parts of the cortex. Earlier experimenters, using the* Horsley and Clarke, Brain, 28, 13, 1905. 240 PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. method of ablation, obtained quite negative results from thestandpoint of localization, but this seems to have been due tothe fact that a faulty anatomical schema was used; a whole hemi-sphere, or the entire vermiform lobe, etc., was removed. Laterexperimenters* have adopted th
A text-book of physiology, for medical students and physicians . ion have been strengthened by the results of com-parative anatomy and especially by the effects of ablation ofdefinite parts of the cortex. Earlier experimenters, using the* Horsley and Clarke, Brain, 28, 13, 1905. 240 PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. method of ablation, obtained quite negative results from thestandpoint of localization, but this seems to have been due tothe fact that a faulty anatomical schema was used; a whole hemi-sphere, or the entire vermiform lobe, etc., was removed. Laterexperimenters* have adopted the newer anatomical schemata,which take account of the true genetic relations of the variouslobes and lobules of the cerebellum, and they have been rewardedby obtaining results of a positive character. The newer anatomicalnomenclature is illustrated in Fig. 104, which gives a schematicrepresentation of the arrangement of the lobules of the cere-bellum of the dog, according to Bolk. Following this schemavan Rynberk reports that excision of the lobulus simplex is. Lmjj Fig. 101. Schema of dogs cerebellum to show Bolks nomenclature for the lobes andBlllci. Dorsal view : , |c>l his anterior (this lobe is separated from the larger posterior lobe by the deep primary fissure, Svr); Ls, lobulus simplex; Lens, lobulus ansiformis; /./>,lobulus paramedianus; /.»i/<, lobulus medianus posterior; AY, format is vermieularis (parstonsillaris); C1, cms primum; -. crus secundum; Svr, sulcus primarius; Sp, sulcusparamedianus ; Si, sulcus intercruralis.—(After van Rynberk.) followed by movements of the head (head nystagmus), whichindicate an abnormal innervation of the neck muscles. Injuryon on side of t he crus primum of I he ansiform lobule is followedby abnormal movements of the forefoot of the same side, whilesimilar injuries to the crus secundum result in abnormal move-ments localized to the hind fool. Extirpation of a lobulusparamedianus causes rolling movements round the long
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