. Principles of human physiology : with their chief applications to pathology, hygiene, and forensic medicine : especially designed for the use of students. thai Brain of Buzzard; the olfactive gangliaare concealed beneath b, the hemispheres;c, optic garfglia; d, cerebellum; g. The hemispheres, b, drawn to either side,to show the subjacent parts;— c, the opticlobes; d, corpus striatum; thai, thalamusopticus. The Cerebral hemispheres, much increased in size, and arching back overthe Thalami and Optic ganglia, but destitute of convolutions and deficientin commissures,—the large cavity still exis
. Principles of human physiology : with their chief applications to pathology, hygiene, and forensic medicine : especially designed for the use of students. thai Brain of Buzzard; the olfactive gangliaare concealed beneath b, the hemispheres;c, optic garfglia; d, cerebellum; g. The hemispheres, b, drawn to either side,to show the subjacent parts;— c, the opticlobes; d, corpus striatum; thai, thalamusopticus. The Cerebral hemispheres, much increased in size, and arching back overthe Thalami and Optic ganglia, but destitute of convolutions and deficientin commissures,—the large cavity still existing in the Optic ganglia, andfreely communicating with the third ventricle,—and the imperfect evolutionof the Cerebellum,—make the correspondence in the general condition ofthe two very considerable. Fig. Brain of human embryo at twelfth week, a, seen from behind; b, side view; c, sectional view;a, corpora quadrigemina; b, b, hemispheres; d, cerebellum; c, medulla oblongata; f, optic thalamus;g, floor of third ventricle; i, olfactory nerve. (After Tiedemann.) 218. The Brain of the lowest Mammalia presents but a slight advanceupon that of Birds, in regard both to the relative proportions of its parts, andto their degree of development. Thus, in the Marsupialia, the Cerebralhemispheres exhibit no convolutions; and the great transverse commissure,—the Corpus Callosum,—is deficient. There is gradually to be noticed,however, in ascending the scale, a backward prolongation of the Cerebralhemispheres; so that first the Optic ganglia, and then the Cerebellum, arecovered by them. The latter partly shows itself, however, in all but theQuadrumana, when we look at the brain from above downwards; in theRabbit, the brain of which is among the lowest in its character of those ofthe true Viviparou
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