The mind and its education / by George Herbert Betts . , cerebellum; Sc, spinal cord. The cere-brum. mass, and others emerge and pass on into the cere-brum, while its two halves also are connected witheach other by means of cross fibers. The cerebrum occupies all the upper part of theskull from the front to the rear. It is divided sym-metrically into two hemispheres, the right and the hemispheres are connected with each other by asmall bridge of fibers called the corpus callosum. Eachiiemisphere is furrowed and ridged with convolutions, THE BRAIN AND NERVOUS SYSTEM 33 an arrangement
The mind and its education / by George Herbert Betts . , cerebellum; Sc, spinal cord. The cere-brum. mass, and others emerge and pass on into the cere-brum, while its two halves also are connected witheach other by means of cross fibers. The cerebrum occupies all the upper part of theskull from the front to the rear. It is divided sym-metrically into two hemispheres, the right and the hemispheres are connected with each other by asmall bridge of fibers called the corpus callosum. Eachiiemisphere is furrowed and ridged with convolutions, THE BRAIN AND NERVOUS SYSTEM 33 an arrangement which allows greater surface for thedistribution of the gray cellular matter over it. Be-sides these irregularities of surface, each hemisphereis marked also by two deep clefts or fissures—the fis-sure of Rolando, extending from the middle upperpart of the hemisphere downward and forward,passing a little in front of the ear and stopping on alevel with the upper part of it; and the fissure of Syl-vius, beginning at the base of the brain somewhat in. Fig. 10.—Diagrammatic side view of brain, showing cerebellum (CB)and medulla oblongata (MO). F F F are placed on the first,second, and third frontal convolutions; AF, on the ascendingfrontal; AP, on the ascending parietal; M, on the marginal; A,on the angular. T T T are placed on the first, second, andthird temporal convolutions. /2-/J marks the fissure of Rolando;S-S, the fissure of Sylvius; PO, the parieto-occipital fissure.—After Angell. front of the ear and extending upward and back-ward at an acute angle with the base of the hemi-sphere. The surface of each hemisphere may be thought ofas mapped out into four lobes: The frontal lobe,which 34 THE MIND AND ITS EDUCATION The lobesof thehemi-(ipheres. includes the front part of the hemisphere and extendsback to the fissure of Rolando and down to the fissureof Sylvius; the parietal lobe, which lies back of thefissure of Rolando and above that of Sylvius and ex- €entra/
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishertoron, bookyear1914
