. Outlines of zoology. upply thefour posterior clefts and arches, the posteriorjelly-tubes, and the heart and stomach. It of:— 1. Ganglionated roots with nerves to the clefts and arches (2 to 5 inclusive), with post-branchial,,prse-branchial, and pharyngeal branches as in IX. 2. A ganglionated root, arising in front of all the others, from which arises the lateral branchinnervating all the posterior sensory tubes. 3. From the fourth branchial branch arises the gang- lionated intestinal which innervates the heart andithe stomach. The spinal cord lies in the cartilaginous neural ar
. Outlines of zoology. upply thefour posterior clefts and arches, the posteriorjelly-tubes, and the heart and stomach. It of:— 1. Ganglionated roots with nerves to the clefts and arches (2 to 5 inclusive), with post-branchial,,prse-branchial, and pharyngeal branches as in IX. 2. A ganglionated root, arising in front of all the others, from which arises the lateral branchinnervating all the posterior sensory tubes. 3. From the fourth branchial branch arises the gang- lionated intestinal which innervates the heart andithe stomach. The spinal cord lies in the cartilaginous neural archwad!above the vertebral column, is divided by deep dorsal anyventral fissures, and gives off numerous spinal nerves,,formed as usual from the union of dorsal (sensory) and 542 PISCES FISHES. ventral (motor) roots. The first sixteen or eighteen nervesform the brachial plexus, which supplies the pectoral fin. The sympathetic system consists of a longitudinal gang-lionated cord along each side of the vertebral Fig. 284. —Side view of chief cranial nerves of Elasmobranchs.—Slightly modified from Cossar Ewart. Over olfactory nerve; ch., over cerebral hemispheres ; ci., overcerebellum ; ^ over medulla oblongata ; m., mouth ; mx.)maxillary branch of 5 ; mandibular branch of g ; ,mandibular branch of seventh nerve ; , groups of ampullae ;, superficial ophthalmic of g ; , ophthalmicus profundus ;, superficial ophthalmic^ of 7; iV., nostril; 3, oculomotor;cs., ciliary ganglion; 5, trigeminal; , inner buccal; , •outer buccal; ^6., buccal of 7 ; ^., pajata- of 7 ; sj>,, spiracle;ch., chorda tympani; , hyomandibular of 7 ; 8, auditory;M., ear; Q, glossopharyngeal; 10, roots of vagus ; /.lo, lateralnerve of vagus ; r. 16, intestinal nerve of vagus ; I-g, gill-clefts. Sense organs.— (a) The eyes (see p. 495). The iris has a fringed upper margin. (b) The ears (see p. 493). The vestibule is connected with the
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
