. The brain as an organ of mind. n with the lower end ofthe ascending parietal convolution, as in the brain of Gauss and inthat of the artizan Krebs. A reference to fig. 135 will show thatthe brain of the Bushwoman is also widest in the situation ofthe very prominent supra-marginal lobules, though these are * Vorstudien, tab. ij. \ Wagner, loc. cit. tab. ij. fig. 4, Chap. XXL] OF THE HUMAN BRAIN. 389 found to be distinctly posterior to the median axis. The brain ofthe eminent mathematician Dirichlet is longer and broader than,either of the others tigured by Wagner. Its posterior extremityis na
. The brain as an organ of mind. n with the lower end ofthe ascending parietal convolution, as in the brain of Gauss and inthat of the artizan Krebs. A reference to fig. 135 will show thatthe brain of the Bushwoman is also widest in the situation ofthe very prominent supra-marginal lobules, though these are * Vorstudien, tab. ij. \ Wagner, loc. cit. tab. ij. fig. 4, Chap. XXL] OF THE HUMAN BRAIN. 389 found to be distinctly posterior to the median axis. The brain ofthe eminent mathematician Dirichlet is longer and broader than,either of the others tigured by Wagner. Its posterior extremityis narrower than the anterior, and even notably pointed. Itsgreatest breadth may be seen to be only slightly posterior to itsmedian axis, and to correspond with the hinder part of the ascend-ing parietal convolution. Notable variations are therefore to be met with in theshape of the Brain as seen from above, as might havebeen expected from a consideration of the diverse shapesof the human Skull in dilBferent races and individuals. We. Ftg. 142.—Brain of Gauss, the Celebrated Mathematician and Astronomer, sideview. (Vogt, after R. Wagner.) F, Frontal lobe ; P, parietal lobe; 0, occipital lobe ; T, temporal lobe; C, cere-bellum ; Po, pons Varolii ; V M, medulla oblongata ; S, Sylvian fissure ; R, fissure ofRolaudo; P >, parallel fissure, a, Upper fold of frontal convolutions ; a^, middlefold of frontal convolutions; a^, lower fold of frontal convolutions. A, Ascendingfrontal (or anterior central) convolution ; B, ascending parietal (or posterior central)convolution; 6, b^, b^, upper, middle, and lower folds of parietal convolutions ;c, c2, c:, upper, middle, and lower folds of temporal convolutions; ci, ^2^ cj3^ upper,middle, and lower folds of occipital convolutions. have extreme long-heads, and extreme round heads,interspersed with multitudes of individuals whose cranialdiameters are more nearly equal. On the whole, it is, 890 THE EXTERNAL CONFIGURATION perhaps, most frequently
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