. Principles of human physiology : with their chief applications to pathology, hygiene, and forensic medicine : especially designed for the use of students. ; mo, motor oculi; ab, abducens;tri, trifacial; fa, facial; au, auditory; vag, vagus; tt, tubercles or ganglia of the trifacial; tv, tuberclesof the vagus. Ethmoid bone. Besides these principal ganglionic enlargements, there areoften smaller ones, with which other nerves are connected. Thus, in theShark, we find a pair of tubercles of considerable size at the origin of theTrifacial nerves; and another pair, in most Fishes, at the roots of
. Principles of human physiology : with their chief applications to pathology, hygiene, and forensic medicine : especially designed for the use of students. ; mo, motor oculi; ab, abducens;tri, trifacial; fa, facial; au, auditory; vag, vagus; tt, tubercles or ganglia of the trifacial; tv, tuberclesof the vagus. Ethmoid bone. Besides these principal ganglionic enlargements, there areoften smaller ones, with which other nerves are connected. Thus, in theShark, we find a pair of tubercles of considerable size at the origin of theTrifacial nerves; and another pair, in most Fishes, at the roots of the some instances, too, distinct Auditory ganglia present themselves. 214. The Optic Lobes of Fishes have no analogy whatever with theThalami optici of Mammalia, the connection of which with the Optic nervesis apparent only. They are rather to be compared with the TuberculaQuadrio-emina, which are the real ganglia of the Optic nerve. Their ana-logy is not so complete, however, to these bodies in the fully-formed Brainof Man, as it is to certain parts which occupy their place at an earlier period. 160 FUNCTIONS OF THE NERVOUS SYSTEM. Fig. The Third Ventricle, which is quite distinct from the Corpora Quadrige-mina, is hollowed out, as it were, from the floor of the Optic Lobes ofFishes; and the Anterior Commissure bounds its front: hence these mustbe considered as analogous to the parts surrounding the Third Ventricle, aswell as to the Corpora Quadrigemina. This is made evident by the fact,observed by Miiller, that, in the Lamprey, there is a distinct Lobe of thethird ventricle, replacing the Optic Lobes of other fishes, and partly givingorigin to the optic nerves; and a separate vesicle, analogous to the CorporaQuadrigemina. With this condition, the early state of the Brain in theembryo of the Bird and Mammiferous animal, and even in Man himself,bears a very close correspondence. The Encephalon consists at this timeof a series of vesicles, arranged in a line with e
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