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.

    106/1256 page 78
    If we remember these important relations of the sensory cranial nerve roots to their peripheral ganglia and to their cerebral nuclei, in a description of their intracerebral course we may for special reasons disregard the earlier view, that the fibers originate from the nuclei. I shall hereafter follow this plan. I shall therefore begin with the sensory nuclei in the medulla oblongata around which the sensory nerves split up. If we recall the position of the motor nuclei, it will be easy to follow the sensory, particularly their relations to the motor. I therefore refer the reader to what has been said above, and to Figs. 72 and 73. The trigeminal nerve has the longest, most extensive termination of all the cerebral nerves. Its nucleus begins far down in the cervical cord, even below the origin of the spinal accessory. The gelatinous substance of the posterior horns and their cells are the ones with which it unites. In the medulla oblongata the nuclei of the posterior columns and subsequently also other cerebral nerve nuclei force the gelatinous substance and the nucleus of the trigeminal nerve from their dorsal position and inward somewhat ventrally. The nucleus, however, retains its lateral position (Figs. 74, 75, 76), therefore remains external to the portions named above, the long motor cells in the medulla oblongata which form the origin of the first motor neurons of the brain. In the region of the rhomboid fossa it follows a deep lateral course up to the anterior middle of this structure, where the nerve itself from Fig. 72.—The Nuclear Origin of the Cranial Nerves. (After Toldt.) without joins the nucleus as a thick bundle (from the Gasserian ganglion) accompanied at first by the motor root which we have already described, and passes from the base obliquely, from without and ventrally inward, and hori- zontally toward the dorsum through the external divisions of the pons (Fig.
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