. A treatise on practical anatomy: for students of anatomy and surgery . fissure of Rolando, andruns upward and backward, and is continuous with thesuperior parietal, which is continued backward to theparieto-occipital fissure. Tlie supra-marginal convolutionlies behind the ascending parietal. It is frequently con-tinuous with the angular,which bends abruptlydownward. The intra-parietal fissure separatesthe supra-marginal fromthe angular convolution. OCCIPITAL CONVOLUTIONS. The occipital convo-lutions are obliquelyplaced, and separated bysecondary fissures, whichvary much in extent anddepth. T
. A treatise on practical anatomy: for students of anatomy and surgery . fissure of Rolando, andruns upward and backward, and is continuous with thesuperior parietal, which is continued backward to theparieto-occipital fissure. Tlie supra-marginal convolutionlies behind the ascending parietal. It is frequently con-tinuous with the angular,which bends abruptlydownward. The intra-parietal fissure separatesthe supra-marginal fromthe angular convolution. OCCIPITAL CONVOLUTIONS. The occipital convo-lutions are obliquelyplaced, and separated bysecondary fissures, whichvary much in extent anddepth. The temporo-sphe-noidal convolutions arehorizontally disposed andseparated by deep andwell-marked fissures, oneof which (that below thefirst temporo-sphenoidalconvolution) is called theparallel fissure. The orhikd convolutions are three in number. Theyrest on the orbital plates of the frontal and on the lesserwings of the sphenoid. Tliey are designated the ante-rior, posterior, and inner, the latter lying parallel withthe commencement of the marginal convolution. These. 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
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomy, bookyear1891
