. Comparative anatomy and physiology. Chap, xii.] BRAIN OF BIRDS. 423 is not always a narrow plate, and in the Crocodilia the central portion forms a distinct " ; Of the thickenings of the cerebral walls, the two most important are the corpora striata in the hemispheres, and the restiform bodies in the medulla oblongata; the former are the ganglionic masses which become developed 011 the floor of the. Fig. 182 A.—Lateral view of the Brain of Eabbit, to show the large olfactory lobes, and the termination of the hemispheres in front of the Cerebellum. (After Huxley.) A, Frontal
. Comparative anatomy and physiology. Chap, xii.] BRAIN OF BIRDS. 423 is not always a narrow plate, and in the Crocodilia the central portion forms a distinct " ; Of the thickenings of the cerebral walls, the two most important are the corpora striata in the hemispheres, and the restiform bodies in the medulla oblongata; the former are the ganglionic masses which become developed 011 the floor of the. Fig. 182 A.—Lateral view of the Brain of Eabbit, to show the large olfactory lobes, and the termination of the hemispheres in front of the Cerebellum. (After Huxley.) A, Frontal lobes ; B, occipital lobes ; sj/, sylvian fissure. brain, and, as they extend inwards, they encroach on the cavity of the lateral ventricle ; as may be sup- posed, they are largest in the Crocodilia. The cor- pora restiformia in a similar manner encroach on the fourth ventricle. In Birds the cerebral hemispheres are propor- tionately still larger in size, and, as the optic lobes, or so-called corpora bigemina (Fig. 181 (B) ; MH) are now c°t at the sides and base of the brain, the cerebral hemispheres so overlap them as to hide them when looked for from above. The cerebellum (Fig. 181 (B) ; HH) is much larger, and its lateral lobes, or flocculi, may be distinguished from its central body, or vermis; while in section this division of the brain presents just the same appearance as the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bell, F. J. (Francis Jeffrey), 1855-1924. London, Cassell
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