. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. THE FOEM-EELATIONS OF THE HUMAN BEAIN. 193 another, as has been done in the preparation shown in Fig. 129, the island lies in full view. The island is then seen to be divided into two small lobules by means of a deep fissure, the sulcus centralis insulce, which passes obliquely upward and backward from below and in front. Several, almost perpendicu- lar, sulci divide the anterior broader lobule into three or four gyri breves insulce. The posterior lobule is really nothing but
. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. THE FOEM-EELATIONS OF THE HUMAN BEAIN. 193 another, as has been done in the preparation shown in Fig. 129, the island lies in full view. The island is then seen to be divided into two small lobules by means of a deep fissure, the sulcus centralis insulce, which passes obliquely upward and backward from below and in front. Several, almost perpendicu- lar, sulci divide the anterior broader lobule into three or four gyri breves insulce. The posterior lobule is really nothing but a single, longer gyrus: the gyrus longus. It borders directly on the temporal lobe. An important fissure, the sulcus centralis or central fissure, begins in the operculum, and ascends from there to the median edge of the hemisphere, which it frequently incises. At the bottom of this fissure a small annectant gyrus not infre- quently divides it into a sujjerior and inferior portion. Eecent surgical. Fig. 130.—Lateral aspect of the brain. The gyri and lobuli are designated by Roman letters^ the sulci and fissurse by italics. operations, as well as the knowledge gained from physiological studies, have made it desirable to divide the fissure in parts. The two genua, the superior genu and the inferior geiiu of the ceyitral sulcus, respectively indicated in the diagram by an asterisk, serve as such points of division. Locate the fissure in Fig. 130. This central sulcus separates the lolus frontalis from the lolus parietalis. All that lies below the Sylvian fissure is called the lohus temporalis. In front of the sulcus centralis lies the anterior central gyrus,^ behind it the posterior central gyrus.^ The region in front of the ^ Circonvolution frontale ascendente of the French writers. ^ Circonvolution parietale ascendente of the French writers. 13. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorati
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