. Quain's elements of anatomy . l eminences. They aredeeply separated in a large part of their extent by the great longitudinalfissure. Fig. 293.—Upper sur-face OP THE BRAINSHOWING THE CONVOLTJ- TiONS (from R. Wag-ner). ^ This view was takenfrom the brain of ProfessorC F. Gauss, the mathema-tician, who died in 1854,aged 78. It is selected asan example of a well-formed brain of the aver-age size wilh fully deve-loj)ed convolutions. «, a, a, superior orfirst frontal convolution ;a,a,a, second or middlefrontal ; «, third or in-ferior frontal; A, A, as-cending frontal convolu-tion ; B, B, ascendin
. Quain's elements of anatomy . l eminences. They aredeeply separated in a large part of their extent by the great longitudinalfissure. Fig. 293.—Upper sur-face OP THE BRAINSHOWING THE CONVOLTJ- TiONS (from R. Wag-ner). ^ This view was takenfrom the brain of ProfessorC F. Gauss, the mathema-tician, who died in 1854,aged 78. It is selected asan example of a well-formed brain of the aver-age size wilh fully deve-loj)ed convolutions. «, a, a, superior orfirst frontal convolution ;a,a,a, second or middlefrontal ; «, third or in-ferior frontal; A, A, as-cending frontal convolu-tion ; B, B, ascendingparietal convolution ; b,superior parietal lobule ;b, inferior parietal lobule ;€, first or upper temporo-sphenoidal convolution;d, first or upper occipitalconvolution ; d, second ormiddle; d, third or lower;I, I, the longitudinal fis-sure ; r, the sulcus of Ro-lando ; p, the externalpaHeto-occipital fissure(which appears, in conse-quence of the position of the brain, nearer to the posterior extremity than it really is).. 330 THE CEREBEAL HEMISPHERES, Each cerebral hemisphere has an outer, convex surface, in contactAvith the yault of the cranium ; an inner or median, flat surface, whichforms one side of the longitudinal fissure ; and an irregular under sur-face, in which is a deep cleft, the fissure of Sylvius. In front of thiscleft the under surface rests in the anterior fossa of the base of the skull,and behind it in the middle fossa, and farther back still, on the tentoriumcerebelli. The great longitudinal fissure (fig. 293, 11), seen upon the uppersurface of the brain, extends from before backwards throughout its wholelength in the median plane, and thus separates the cerebrum, as abeadystated, into a right and left hemisphere. On opening this fissure, it isseen, both before and behind, to pass quite through to the base of thecerebrum ; but in the middle it is interrupted by a large transverse massof white substance, named the corims callosum or great commissure,whic
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
