. The brain as an organ of mind. epresent strictly homologous parts in inferior Monkeys,in higher Apes, and also in the Brain of Man. Concealed by the lips of the Sylvian fissure, and form-ing part of its floor, we may find the small Central Lobe,commonly known as the Island of Eeil. This part be-comes well marked and even complex in Man, and, accord-ing to Flower,* is traceable, except in the diminutiveMarmoset, throughout the Quadrumanous series, thoughit is absent in all other Mammalia. * Trans, of Zoolog. Soc, 1860, vol. v. p. 802 THE BRAIN OF QUADRUMANA. Three other Fissures of sec
. The brain as an organ of mind. epresent strictly homologous parts in inferior Monkeys,in higher Apes, and also in the Brain of Man. Concealed by the lips of the Sylvian fissure, and form-ing part of its floor, we may find the small Central Lobe,commonly known as the Island of Eeil. This part be-comes well marked and even complex in Man, and, accord-ing to Flower,* is traceable, except in the diminutiveMarmoset, throughout the Quadrumanous series, thoughit is absent in all other Mammalia. * Trans, of Zoolog. Soc, 1860, vol. v. p. 802 THE BRAIN OF QUADRUMANA. Three other Fissures of secondary importance are easilyrecognizable in each of the great man-like Apes, as wellas in many of the lower forms, viz., the Parallel Fissure,situated parallel with, and posterior to, the fissure of Syl-vius, in the long axis of the Temporal Lobe; the Calloso-marginal Fissure on the inner side of the Hemisphere(fig. 120), just above the Corpus Callosum ; and the Fissureof the Hip2^ocampus, situated near the junction of the inner. Fig. 121.—Brain of Orang, side view. (Vogt, after Gratiolet.) Letters of referenceas in Figs. Ill, 133, and 142—with which compare. with the under surface of the posterior half of the Hemi-sphere (fig. 120,/. c). Next to the Sylvian, the Parallel Fissure is the mostconstant of the markings on the outer surface of the Cere-bral Hemisphere (fig. 105) ; though after this, according toFlower, the most persistent fissure on the outer faceappears to be the one bounding the upper border of theangular gyrus (fig. 107, )n). The same anatomist adds :—* But it is, perhapSj the sulci of the inner face of the hemi- Chap. XVII.] THE BRAIN OF QUADRUMANA. 303 sphere that are most characteristic of the Primates, andoffer the most striking diflerential features from otherMammalia. The posterior part of the HippocampalFissure, named Calcarine by Huxley (lig. 120, /. c),is peculiar to Man and the Quadrumana. It sometimespersists deeply marked in the lowest forms, wh
Size: 1796px × 1392px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1, booksubjectbrain, booksubjectpsychologycomparative
