. Diseases of the nervous system : for the general practitioner and student. ecentralis inferior, n, nSul. praecentralis superior. 0. Sul. post-centralis inferior, p. Sul. post-centralis superior, q.Ramus horizontals and r, ramus occipitalis of interparietal sulcus. 5. Sul. transversus. /.Sulci superior and lateralis, u. Incisura prasoccipitalis. v. Sul. temporalis superior, w. SuLtemporalis medius. Interior of the Brain.—A horizontal section through both hemispheresreveals the presence of gray and white matter, also of lateral ventricles. Gray Substance.—Besides the cortical gray matter there

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. Diseases of the nervous system : for the general practitioner and student. ecentralis inferior, n, nSul. praecentralis superior. 0. Sul. post-centralis inferior, p. Sul. post-centralis superior, q.Ramus horizontals and r, ramus occipitalis of interparietal sulcus. 5. Sul. transversus. /.Sulci superior and lateralis, u. Incisura prasoccipitalis. v. Sul. temporalis superior, w. SuLtemporalis medius. Interior of the Brain.—A horizontal section through both hemispheresreveals the presence of gray and white matter, also of lateral ventricles. Gray Substance.—Besides the cortical gray matter there are alsoisolated masses called basal ganglia. The latter are three in number, viz. Thalamus, Caudate and Lenticular nuclei. The two last ones are alsoknown under the name of Corpora striata. The thalamus was discussedin the preceding chapter (Fig. 28). Caudate Nucleus belongs to the wall of the lateral ventricle. Itforms the floor in the upper portion and the roof in the lower portion of 28 THE CENTRAL NERVOUS SYSTEM CENTRAL SULCUS (ROLANDI) PARIETAL LOBE FRONTAL LOBE. OCCIPITAL LOBE CEREBELLUM CENTRAL LOBE {INSULA) TEMPORAL LOBE PONS CENTRAL SULCUS OP INSULA Fig. 23.—Diagram of the Convex Surface of thf Left Cerebral Hemisphere showing the FrvE Principal Lobes of the Pallium. (Morris Anatomy.)The opercular regions of the frontal, pacietal, and temporal lobes are removed to show the central lobe or island of Reil.