Diseases of the nervous system .. . Fig. 75.—Section through the Medulla Oblongata at the Point of Exit of the Pneu-MOGASTRic. (Diagram after Edinger.) NEURON SYSTEMS AND NEURON DISEASES 81 We next consider the nuclei of the pneumogastric, the sensory root of whicharises from the jugular ganglion combined with that of the giosso-pharyngealwhich originates in the petrosal ganglion in the medulla oblongata closebehind the auditory nerve (see below) between the olive and the restiformbody (Fig. 77). The motor origin of the vagus in the nucleus ambiguus hasalready been described (Figs. 72. 73, 74)
Diseases of the nervous system .. . Fig. 75.—Section through the Medulla Oblongata at the Point of Exit of the Pneu-MOGASTRic. (Diagram after Edinger.) NEURON SYSTEMS AND NEURON DISEASES 81 We next consider the nuclei of the pneumogastric, the sensory root of whicharises from the jugular ganglion combined with that of the giosso-pharyngealwhich originates in the petrosal ganglion in the medulla oblongata closebehind the auditory nerve (see below) between the olive and the restiformbody (Fig. 77). The motor origin of the vagus in the nucleus ambiguus hasalready been described (Figs. 72. 73, 74). It is situated in that chain ofmotor cells the position of which about corresponds to the lateral horn ofthe cervical cord. Dorsally from this, in the position in which the posteriorhorns were formerly situated, and simultaneously forced to the interior bythe nuclei of the posterior columns pressing to the side, is the sensory nucleusof the pneumogastric (Figs. 72, 73. 74, 76). It originates in the medulla !^ j(ocif-r- *. ^ hypoxias Fig. 76. -Section through the Medulla Obloxgata at the Height of the PosteriorHypoglossal Roots. (Diagram after Edinger.) about at the point where the olives trend somewhat more ventrally, and passesfrontally as far as the beginning of the second third of the fourth anterior point is. of course, to be distinguished as the nucleus of thegiosso-pharyngeal nerve. The nucleus of the vagus is situated upon the floorof the fourth ventricle laterally to that of the liypogJossal nerve (Figs. 72, 73,74. 76). and here its darl- pigmented srlistening cells form the ala cinerea(Fig. 78). The accumulation of cells just described does not. however, form the onlynuclei of the pneumogastric. The fibers of the vagus root, like the fibers ofthe trigeminal with their descending branches, the so-colled ascending root,unite with cells w^hich. like the ascending nucleus of the trigeminal nerve,may be followed down into the cervical cord, although
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