The elasmobranch fishes . elasmobranchfish03dani Year: 1934 THE ELASMOBRANCH FISHES 245 branches into a brancliio-intestinal bnndlo. The lateral line nerve can be traced from the brain as a distinct stem. As it emerges from the cranium it swells out into a large ganglion from which this branch proceeds posteriorly practically to the end of the tail. From the lateral line ganglion there is given off a dorsal root, the supratemporalis (fig. 245) which })asses upward and forward to supply the suprateniporal canal, pit organs in the region of the supratemporal canal, and the anterior part of the
The elasmobranch fishes . elasmobranchfish03dani Year: 1934 THE ELASMOBRANCH FISHES 245 branches into a brancliio-intestinal bnndlo. The lateral line nerve can be traced from the brain as a distinct stem. As it emerges from the cranium it swells out into a large ganglion from which this branch proceeds posteriorly practically to the end of the tail. From the lateral line ganglion there is given off a dorsal root, the supratemporalis (fig. 245) which })asses upward and forward to supply the suprateniporal canal, pit organs in the region of the supratemporal canal, and the anterior part of the lateral line canal immediately behind the segment supplied by the supratemporal branch of the ninth nerve. Posterior to this branch there is given off a second branch, the dorsalis (, fig. 220) Fig. 223. Brachial and pelvic plexuses, Eaja vomer. (From Braus.) which runs posteriorly almost to the first dorsal fin. This nerve supplies sense organs of the anterior part of the lateral canal and also pit organs above the line and anterior to the dorsal fin. Many branches are given off from the lateral line nerve as it passes backward in the body to the sense organs along the lateral line canal. The branchial stem in the vagus is a strong bundle which divides into four (pentanchids), five (hexanchids), or six (heptanchids) branchial nerves. The first two or three of these branchial nerves, except in Torpedo, where the first and second branchials give off the third and fourth electric nerves, are essen- tially like the branchial division of the glossopharyngeal. Each branchial con- sists of pharyngeal and pre- and post-trematic nerves. The post-trematicus of the vagus is composed of two strong branches, one of which is motor, the other sensory. The motor division innervates the interarcual, interbranchial, adductor, and ventral constrictor muscles. The last branchial nerve is com- posed only of visceral sensory fibers (Norris and Hughes, 1920). The ramus intestinalis or visceral
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