. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . ies of hori-zontal fissures, which divide the lobe into the superior, middle,and inferior temporal gyres. The subdivision of the parietal andoccipital lobes is not quite so simply made. The intraparietalfissure separates the superior parietal gyre from the rest of the lobe;below this, two parts are easily distinguished—namely, the supra-marginal gyre, which curves around the end of the fissure of Syl- 222 THE CEREBRAL HEMISPHERES vius, and the angular
. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . ies of hori-zontal fissures, which divide the lobe into the superior, middle,and inferior temporal gyres. The subdivision of the parietal andoccipital lobes is not quite so simply made. The intraparietalfissure separates the superior parietal gyre from the rest of the lobe;below this, two parts are easily distinguished—namely, the supra-marginal gyre, which curves around the end of the fissure of Syl- 222 THE CEREBRAL HEMISPHERES vius, and the angular gyre, which curves around the end of the supe-rior temporal fissure. On the lateral surface of the occipital lobethe divisions are not specially clear or constant; but superior, mid-dle, and inferior gyres are customarily recognized. On the mesial surface (Fig. 96), a prominent fissure is thecingulate, extending parallel to the callosum, and separating thelimbic lobe from the frontal and parietal. The central fissureoften shows itself on the mesial surface; and the gyre which curves Cingulate fiSBure, Central fissure Paracentral lobule. Optic chiasm Fia. 96.—Mesial Surface of the Right Cerebral Hemisphere. (Edlnger.) around its end is called the paracentral lobule. The parieto-occipital fissure is strongly marked on this surface, and forms aclear division between the parietal and occipital lobes. Withinthe occipital lobe, there appears on the mesial surface a prominentfissure, called the calcarine, which is of great importance in dis-cussions of localization. The calcarine fissure joins the parieto-occipital, and the triangular gyre which lies between them is calledthe cuneus, while the gyre which lies immediately beneath the cal-carine fissure is the lingual; beneath this, again, is the fusiform. These, then, are the chief landmarks on the surface of the brain,which are of use in our studies for the localization of cerebral func-tions, § 11. A section through the cerebra
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