. A treatise on practical anatomy: for students of anatomy and surgery . Fig. 122.—Orbital Surface of theLeft Frontal Lobe and the Isl- AKD OF ReIL , THE TiP OF THE TEM- pobo-Sphenoidal Lobe has beenRemoved. 17, convolution of the margin of the longitudinalfissure; O, olfactory fissure, with the olfactory lobe re-moved: TR, triradiate fissure: 1 and H, convolu-tions of the orbital surface : I, 1, under surface ofthe infero-frontal convolution : 4, under surface of theascending frontal, and .5, of the ascending parietal con-volutions; C, central lobe, or island. 284 PRACTICAL ANATOMr. convo
. A treatise on practical anatomy: for students of anatomy and surgery . Fig. 122.—Orbital Surface of theLeft Frontal Lobe and the Isl- AKD OF ReIL , THE TiP OF THE TEM- pobo-Sphenoidal Lobe has beenRemoved. 17, convolution of the margin of the longitudinalfissure; O, olfactory fissure, with the olfactory lobe re-moved: TR, triradiate fissure: 1 and H, convolu-tions of the orbital surface : I, 1, under surface ofthe infero-frontal convolution : 4, under surface of theascending frontal, and .5, of the ascending parietal con-volutions; C, central lobe, or island. 284 PRACTICAL ANATOMr. convolutions are separated by the stellate fissure. Byseparating the frontal and temporo-sphenoidal lobes, theisland of Reil is exposed. It consists of a cluster offive or six convolutions projecting from the bottom of thefissure of Sylvius. The inner surface of the cerebral hemisphere is flatand presents five principal convolutions. First, themarginal convolution skirts the free border of the longi-. FiG. 123.—Left Hemisphere ok Brain, showing Isi>and of Reil. In, island of Reil; So, sulcus centralis ; Gca, Gcp, gyrus centralis, anterior and posterior ;Fop, fiasura parieto-occipitalia. tudinal fissure. It begins at the inner side of the orbitallobe and passes upward and backward to the junction ofthe calloso-marginal and Rolandic fissures. Behind, it isthe quadrate convolution, which is separated from thecuneate lobule by the parieto-occipital fissure. Thesethree convolutions—the marginal, quadrate, and cune-ate—are all placed along the free border of the longi-tudinal fissure. FISSURES OF TilE CEREBRUM. 285 The gyrus foriiicatus, or arched convolution, arises incommon with the marginal, and curves upward andbackward over the corpus callosum, and becomes con-tinuous with the quadrate and uncinate convolutions. The interval between the corpus callosum and gyrusfornicatus has been called the ventricle of the corpuscallosum. The uncinate, or hippocampal gyrus, arisesbelow t
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomy, bookyear1891
