. The elasmobranch fishes . Fig. 220. Cranial nerves, Squalus acanthias. (From Norris and Hughes.) , brachial plexus; , buccalis of seventh; , ramus dorsalis of tenth nerve; gri., first spinal ganglion; hb., hypobranchial bundle; limd., hyomandibularis; , lateral line nerve; , mandibularis externus of seventh ; , maudibularis internus of seventh; , mandibularis of fifth; , maxillaris of fifth; , ophthalmicus pro- fundus; , and , ophthalmicus superficialis of fifth and seventh; , pharyn- geal branch of ninth; , palatinus of seven
. The elasmobranch fishes . Fig. 220. Cranial nerves, Squalus acanthias. (From Norris and Hughes.) , brachial plexus; , buccalis of seventh; , ramus dorsalis of tenth nerve; gri., first spinal ganglion; hb., hypobranchial bundle; limd., hyomandibularis; , lateral line nerve; , mandibularis externus of seventh ; , maudibularis internus of seventh; , mandibularis of fifth; , maxillaris of fifth; , ophthalmicus pro- fundus; , and , ophthalmicus superficialis of fifth and seventh; , pharyn- geal branch of ninth; , palatinus of seventh; , post-trematicus of ninth; , pretrematicus of ninth; sp., spiracle; , supratemporalis of ninth; , supratem- poralis of tenth nerve; , visceral nerve; 1/ and 2, occipitospinal nerves; II, optic; ///, oculomotor; IV, trochlearis; VI, abducens; VIII, auditory nerve. and sensory portions, motor fibers predominate in the anterior part and sensory in the posterior root. The motor fibers arise from the visceromotor nucleus in the medulla (, fig. 216) and are distributed principally to the muscles of the jaws. The sensory fibers arise from various ganglia, such as the ganglion of the ophthalmicus profundus, the ophthalmicus superficialis (Mus- telus californicus), and the gasserian ganglion. Sensation brought from the region around the nose passes by the ganglion cells and on to the brain. In the Elasmobranchs the ganglia of the trigeminal and the buccal division of the facial nerves are so intimately associated as often to be inseparable; usually the former are more or less covered up by the latter. In Chlamydosel- aclius, however (fig. 219), the two are distinct medially (Hawkes, 1906). From the gasserian ganglion {g.) the large maxillaris and the mandibularis divisions of the fifth nerve arise and from the small ganglion on the inner side of the gasserian, the two smaller nerves, the ramus profundus {) and the ramus superficialis {) of the fi
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