Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 VERTEBRATES. 301 This line of organs is plainly seen on the side of the body in most fishes. On the head, however, it frequently branches greatly and becomes enormously extended in this way. The occurrence of these structures in aquatic forms only would suggest that their function is connected FIG. 110.—Diagram of cranial nerves, a, alveolaris nerve*, b, buccalis nerve; c, cerebrum; cb, cerebellum; ct, chorda tympani; e, ear; er, external rectus muscle; /, inferior rectus muscle; g, G
Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 VERTEBRATES. 301 This line of organs is plainly seen on the side of the body in most fishes. On the head, however, it frequently branches greatly and becomes enormously extended in this way. The occurrence of these structures in aquatic forms only would suggest that their function is connected FIG. 110.—Diagram of cranial nerves, a, alveolaris nerve*, b, buccalis nerve; c, cerebrum; cb, cerebellum; ct, chorda tympani; e, ear; er, external rectus muscle; /, inferior rectus muscle; g, Gasserian ganglion; h, hyoid cartilage; hm, hyomandibular cartilage; hmd, hyomandibular nerve; i, internal rectus muscle; to, inferior oblique muscle; j, Jacobson's commissure; Z, lateralis branch of vagus nerve; m, mouth; me, Meckel's cartilage; md, mandibularis nerve; mx, maxillaris superior nerve; n, nose; o, optic lobes; op, ophthal- micus profundus nerve; os, ophthalmicus superficialis nerve; p, pinealis;p/, palatine nerve; po, posttrematic branch; pn, intestinal (pneumogastric) nerve; pr, pretrematic branch; ptq, pterygoquadrate cartilage; s, spiracle; so, superior oblique muscle; sr, superior recfus muscle; t, 'twixt-brain; I-X, cranial nerves; 1-5, gill-slits. with that element; but what that function is, is not well understood. The taste-organs are within the mouth, principally on the tongue. They are poorly developed in some vertebrates, better in others. The olfactory organs are always placed in front of the mouth. They consist of a membrane folded so as to ex- pose a great amount of surface, and this surface is covered with the sensory structure, connected with the ends of the olfactory nerve. In the fishes the sacs containing this
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