. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . fourth nerve; t, fifth nerve; u, sixth nerve; /, facial; I, auditory; r/, glossopharyngeal; v, vagus; s, spinal accessory; n, hypoglossal; X, pons 350.—Longitudinal section through center of brain of horse, presenting view of internal surface (after Solly and Leuret). , corpus callosum; p, thalamus; co, middle commissure; t. q, corpora quadrigemina, in front of which is the pineal body. The cerebellum lias been cut through. nevertheless true that brain-weight and the hi
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . fourth nerve; t, fifth nerve; u, sixth nerve; /, facial; I, auditory; r/, glossopharyngeal; v, vagus; s, spinal accessory; n, hypoglossal; X, pons 350.—Longitudinal section through center of brain of horse, presenting view of internal surface (after Solly and Leuret). , corpus callosum; p, thalamus; co, middle commissure; t. q, corpora quadrigemina, in front of which is the pineal body. The cerebellum lias been cut through. nevertheless true that brain-weight and the higher powers ofman bear a close though not invariable relationship. Theapparent discrepancies are susceptible of explanation. Besides the gray matter, with its cells of highest functionalvalue from the standpoint now taken, the brain consists, andin large part, of neuroglia and nerve-fibers, with probablychiefly, and in the case of the fibers solely, a conducting func-tion. THE BRAIN. 491 The Connection of one Part of the Brain with another -Though it has long been known that the different parts of the. suDra-orbit-il- 7 p \r j? t tr ,, „ ■ eyjviannssure, /». the insula; S. Or, S. Oc, M. Oc, I. Oc, the three occipUalgyri. ^ ^ three temPoraI> and 492 COMPARATIVE PHYSIOLOGY. brain were connected by bridges of fibers (commissures, etc.),tbe physiological significance of the fact seems to have beenlargely ignored, and even at the present day is too little con-
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