. A treatise on nervous and mental diseases, for students and practitioners of medicine. pus minor, which is also called the calcar avis orcocks spur. Upon this inturned surface of the hemisphere are a numberof other convolutions with which we must become familiar. In frontof the cuneus is seen the precuneus. In front of this again is the so-called paracentral lobule, which consists of the surface inturned uponthis aspect of the brain of the two ascending convolutions, the ascend-ing parietal and the ascending frontal. At the anterior boundaryof the paracentral lobule is seen the calloso-margi
. A treatise on nervous and mental diseases, for students and practitioners of medicine. pus minor, which is also called the calcar avis orcocks spur. Upon this inturned surface of the hemisphere are a numberof other convolutions with which we must become familiar. In frontof the cuneus is seen the precuneus. In front of this again is the so-called paracentral lobule, which consists of the surface inturned uponthis aspect of the brain of the two ascending convolutions, the ascend-ing parietal and the ascending frontal. At the anterior boundaryof the paracentral lobule is seen the calloso-marginal fissure curvingforward, downward, and backward. Above this, in front of theparacentral lobule, is the inturned surface of the first frontal convo-lution, whose outer surface upon the hemisphere we have seen inFig. 1. Curving around the corpus callosum is the gyrus fornicatusor arched convolution, the longest of all the cerebral arch around the corpus callosum is seen in Fig. 3, being knownin its anterior and middle portions as the gyrus fornicatus, but in Fig. 4,. Form of convolutions of the ujjper and lateral surface of the hemisphere. its posterior and lower portions being continuous with the hy^po-campaP aud the uncinate^ convolutions. The rear portion of thehippocampal convolution is split by the junction of the parieto-occipital aud calcarine fissures, below Mhich junction are the lingualand the fusiform lobes, as will be seen in Fig. 3. The form of aportion of these diiferent convolutions of the upper and lateral sur-face of the hemispheres can be better studied in detail in Fig. 4. 1 The hippocampal convolution, or gyrus hippocampi, is so called because it isadjacent to the hippocampus major or the cornu ammonis, which is an eminencealong the floor of the adjacent horn of the lateral ventricle. ^ The uncinate convolution, from uncitius, a hook or barb, is so called because itis of a hook shape, and is considered as belonging to the hippocampal convol
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