Diseases of the nervous system / edited by Archibald Church.

Date:
1908
Catalogue details

Licence: In copyright

Credit: Diseases of the nervous system / edited by Archibald Church. Source: Wellcome Collection.

    109/1256 page 81
    We next consider the nuclei of the pneumogastric, the sensory root of which arises from the jugular ganglion combined with that of the glosso-pharyngeal which originates in the petrosal ganglion in the medulla oblongata close behind the auditory nerve (see below) between the olive and the restiform body (Fig. 77). The motor origin of the vagus in the nucleus ambiguus has already been described (Figs. 72, 73, 74). It is situated in that chain of motor cells the position of which about corresponds to the lateral horn of the cervical cord. Dorsally from this, in the position in which the posterior horns were formerly situated, and simultaneously forced to the interior by the nuclei of the posterior columns pressing to the side, is the sensory nucleus of the pneumogastric (Figs. 72, 73, 74, 76). It originates in the medulla Fig. 76.—Section through the Medulla Oblongata at the Height of the Posterior Hypoglossal Roots. (Diagram after Edinger.) about at the point where the olives trend somewhat more ventrally, and passes frontally as far as the beginning of the second third of the fourth ventricle. Its anterior point is, of course, to be distinguished as the nucleus of the glosso-pharyngeal nerve. The nucleus of the vagus is situated upon the floor of the fourth ventricle laterally to that of the hypoglossal nerve (Figs. 72, 73, 74, 76), and here its dark pigmented glistening cells form the ala cinerea (Fig. 78). The accumulation of cells just described does not, however, form the only nuclei of the pneumogastric. The fibers of the vagus root, like the fibers of the trigeminal with their descending branches, the so-colled ascending root, unite with cells which, like the ascending nucleus of the trigeminal nerve, may be followed down into the cervical cord, although less far, and commu- nicate with the cell group fibers of the ascending root of the glosso-pharyngeal nerve. These cells, like those of the trigeminal nerve and parallel with them, 51 b-
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