. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. 192 ANATOMY OF THE CENTEAL NEKVOUS SYSTEM. are distinctly to be seen. All the rest of the brain is still smooth (compare Fig. 23). From this developmental period on, fissures (sulci) are formed on the surface of the hemisphere by local elevations (gyri) of the cortex. These sulci and gyri increase more and more in the later months of fetal life, nntil^ at the time of birth, almost all the fissures and convolutions which the adult , brain will possess are clearly defined. The
. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. 192 ANATOMY OF THE CENTEAL NEKVOUS SYSTEM. are distinctly to be seen. All the rest of the brain is still smooth (compare Fig. 23). From this developmental period on, fissures (sulci) are formed on the surface of the hemisphere by local elevations (gyri) of the cortex. These sulci and gyri increase more and more in the later months of fetal life, nntil^ at the time of birth, almost all the fissures and convolutions which the adult , brain will possess are clearly defined. The following drawings, purely diagrammatic, may serve as' guides in the study of the surface of the hemispheres. Only the more important and constant fissures and convolutions are therein indicated. A simple. Fig. 129.—The left hemisi^here with the fissura Sylvii drawn apart in order to show the insula (In). 8c, Sulcus centralis, gca, gcp, Gyrus centralis anterior and posterior. Fop, Fissura parieto-occipitalis. (After Henle.) diagram is more easily remembered than representations of the surface of the brain, which reproduce the smaller gyri and shallower sulci, all of which are inconstant, alongside of those which are more pronounced and constanb. First locate the fissure of Sylvius. It separates the greatest part of the temporal lobe from the rest of the brain. A long posterior limb and one or two short anterior branches, which are directed upward, are distinguished on it. The mass of the brain which lies at the point where these join one another covers the island of Eeil and is called the operculum. If those parts of the brain which surround the fissure of Sylvius are separated from one. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Edinger, Ludwig, 1855-1918; Hall, Winfield Scott, b. 1861; Holland, Phil
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Keywords: ., bookcentury1800, bookdecade1890, booksub, booksubjectneuroanatomy
