. Diseases of the nervous system : for the general practitioner and student. tubercinereum. They are all parts of the floor of the third ventricle. CEREBRAL HEMISPHERES. TELENCEPHALON They are two symmetrical masses of nervous tissue, ovoid in occupy the cranial cavity. Their surface is gray (cortex). Theaverage length is 16 cm., width 13 cm., height 12 cm. They present aConvexity and Base. A longitudinal fissure separates the two hemispheres. From thecerebellum, over which lie the occipital lobes, and from the mesencephalon(see above) they are separated by a transverse fissure. Eac
. Diseases of the nervous system : for the general practitioner and student. tubercinereum. They are all parts of the floor of the third ventricle. CEREBRAL HEMISPHERES. TELENCEPHALON They are two symmetrical masses of nervous tissue, ovoid in occupy the cranial cavity. Their surface is gray (cortex). Theaverage length is 16 cm., width 13 cm., height 12 cm. They present aConvexity and Base. A longitudinal fissure separates the two hemispheres. From thecerebellum, over which lie the occipital lobes, and from the mesencephalon(see above) they are separated by a transverse fissure. Each hemispherepresents an external, mesial and inferior surface. THE CENTRAL NERVOUS SYSTEM 27 A number of fissures or sulci divide each hemisphere into lobes, lobules,convolutions. The adjoining illustrations are sufficient to give a correctidea of the division and subdivision of the cerebral cortex by the fissures,also of the Base of the Brain with the cranial nerves (Figs. 22, 23, 24, 25,26, 27). As to the function of the various areas, see the chapter on Fig. 22.—Gyri of Convex Surface of Left Cerebral Hemisphere. (Santee.) Fissura lateralis cerebri: a. Stem. b. Horizontal anterior ramus, c. Ascending anteriorramus, d. Posterior ramus, e, e. Sulcus centralis (Rolandi). /. Genu superius. g. Genuinferius. h. Sul. occipito-parietalis. i,i,i. Sul. frontalis superior. j,j. Sul. frontalis , k. Sul. frontalis medius. I, I. Sul. paramedialis. m, m. Sul. praecentralis inferior, n, nSul. praecentralis superior. 0. Sul. post-centralis inferior, p. Sul. post-centralis superior, 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnervous, bookyear1913
