Diseases of the nervous system .. . Now there is also an ascending trigeminal root (Figs. 73, 73, 9(), 97, 98).This is distributed al)0ut nerve-cells which may be traced to the middle most frontal position is in the region of the corpora quadrigemina, later-ally from the aqueduct of Sylvius, therefore laterally to the nuclei of theoculomotor and trochlear, and at the same time somewhat toward the the nucleus of the descending trigeminal root extends caudally up tothe lateral borders of the anterior portion of the fourth ventricle where itapproaches the surface and where
Diseases of the nervous system .. . Now there is also an ascending trigeminal root (Figs. 73, 73, 9(), 97, 98).This is distributed al)0ut nerve-cells which may be traced to the middle most frontal position is in the region of the corpora quadrigemina, later-ally from the aqueduct of Sylvius, therefore laterally to the nuclei of theoculomotor and trochlear, and at the same time somewhat toward the the nucleus of the descending trigeminal root extends caudally up tothe lateral borders of the anterior portion of the fourth ventricle where itapproaches the surface and where, by pigmentation of its cells, it becomesvisible as the locus cccruleus (Fig. 78). There it unites with the main nucleusof the trigeminal nerve. 1 According to the neuron theory, the designation descending root would be thecorrect one. 80 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM We are still in doubt as to the relations of the descending trigeminal rootsto this nucleus. It is uncertain whether the fibers of the nerve here split, or. Fig. 74.—Section through the Medulla Oblongata. (After Edinger.) whether they rise at this point, and therefore constitute a descending cen-trifugal tract. In fact, the nerve fibers of this tract unite with those of themotor, not with the sensor}^ root (radix mesencephalica).
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