. The physiology of the domestic animals; a text-book for veterinary and medical students and practitioners. Physiology, Comparative; Domestic animals. FUNCTIONS OP THE BRAIN. 807 The basal ganglia likewise depend for their degree of development upon the position of the animal in the zoological series. Thus the corpora quadrigemina are, as their name implies, divided into four emi- nences in all mammals, the anterior pair being larger in herbivora and the posterior in carnivora. In birds, reptiles, and fishes they consist only of a single pair of ganglionic masses, and are termed the corpora b
. The physiology of the domestic animals; a text-book for veterinary and medical students and practitioners. Physiology, Comparative; Domestic animals. FUNCTIONS OP THE BRAIN. 807 The basal ganglia likewise depend for their degree of development upon the position of the animal in the zoological series. Thus the corpora quadrigemina are, as their name implies, divided into four emi- nences in all mammals, the anterior pair being larger in herbivora and the posterior in carnivora. In birds, reptiles, and fishes they consist only of a single pair of ganglionic masses, and are termed the corpora bigemina, or optic FIG. 349.—Orbital Surface of the Left Frontal Lobe and the Island of Reil, the Tip of the Temporo - Sphenoidal Lobe Removed to Show the Latter. (Landois.) 17, convolution of the margin of the longitu- dinal fissure; 0. olfactory fissure, with tho olfac- tory lobe removed ; TR, triradiate fissure : 111 and i"i, convolutions of the orbital surface; 1,1,1,1, under surface of the infero-frontal convolution: I, nnder surface of the ascending frontal, and, 5, of tne ascending parietal convolutions: C, central lobe, or island. Fig. 350.—Brain of Dog, Superior Surface. (Colin.) 1, 2, 3, 4, the four primary convolutions; a, centre for superior cervical muscles: ft, for adductors and extensors of anterior ex- tremity; c, for flexors and rotators of anterior extremity; d, motor centre for posterior extremity; /, centre for facial muscles. So, also, the corpora striata in all vertebrates are covered by the cere- bral hemispheres, but in descending the animal series the reduction in the size of the cerebral lobes gives a relatively greater importance to the corpora striata. The size of the optic and olfactory lobes varies in dif- ferent groups of animals, being largest in those in -which the special senses associated with these parts of the brain are most highly Please note that these images are extracted from scanned page images that may have
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