. Comparative anatomy. Anatomy, Comparative. 528 COMPARATIVE ANATOMY arising from cells within the brain are unique in amniotes, although such relations are not uncommon in invertebrates and amphioxus. (Fig. 516) In the anamnia the ophthalmic branch of the trigeminus divides into a superficial branch, which innervates the skin of the snout but not the lateral line sense organs of that region, and a deep or profundus branch. Fig. 438.—The twelve cranial nerves shown as if projected upon a median section of the head. I. Olfactory lobe. II. Optic. III. Oculomotor, IV. Trochlearis. V. Trigeminus.
. Comparative anatomy. Anatomy, Comparative. 528 COMPARATIVE ANATOMY arising from cells within the brain are unique in amniotes, although such relations are not uncommon in invertebrates and amphioxus. (Fig. 516) In the anamnia the ophthalmic branch of the trigeminus divides into a superficial branch, which innervates the skin of the snout but not the lateral line sense organs of that region, and a deep or profundus branch. Fig. 438.—The twelve cranial nerves shown as if projected upon a median section of the head. I. Olfactory lobe. II. Optic. III. Oculomotor, IV. Trochlearis. V. Trigeminus. VI. Abducens. VII. Facialis. VIII. Acusticus. IX. Glossopharyngeus. X. Vagus. XI. Accessorius. XII. Hypoglossus. which passes through the orbit to the snout. Both contain general somatic sensory fibers. As stated above, in cyclostomes the deep ophthal- mic is an independent nerve with a separate ganglion and root and is therefore regarded by many morphologists as a "segmental" nerve. In most anamnia, however, the root of the profundus nerve joins that of the rest of the trigeminus and persists in amniotes as a branch of that 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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