. The Journal of comparative neurology and psychology. rs is the caudally through the lateral part of the tectum the bundlepasses through the lateral part of the velum medullary anterius orcorresponding region, continues on the internal surface of thel)racliium conjunctivum and internal face of the lateral wall of thefourth ventricle (locus coeruleus), passes over the motor nucleus ofthe trigeminus, turns laterad at the same time and crosses the motorroot bundles at a greater or less angle, and joins the sensory root atthe y)oint of exit or joins the spinal trigeminal tract some d
. The Journal of comparative neurology and psychology. rs is the caudally through the lateral part of the tectum the bundlepasses through the lateral part of the velum medullary anterius orcorresponding region, continues on the internal surface of thel)racliium conjunctivum and internal face of the lateral wall of thefourth ventricle (locus coeruleus), passes over the motor nucleus ofthe trigeminus, turns laterad at the same time and crosses the motorroot bundles at a greater or less angle, and joins the sensory root atthe y)oint of exit or joins the spinal trigeminal tract some distancecaudal to the root. As it passes through the velum meduUare thel)undle, in the forms studied by me, always holds the same relation tothe IVth nerve and other bundles in the velum: namely, it runslateral and dorsal to the ascending root portion of the IVth nerveand ventral to the trunk of this nerve after its decussation. Theradix mesencephalica trigemini also runs beneath the decussatio veli 610 Journal of Comparative Neurology and Fig. 9. Three sagittal sections of the tectum of Scyllium stellare. A, nearlymedian, showing the greatest extent of the nucleus tecti. B, through thelateral part of the aqueduct. The mesencephalic bundle is seen passingbeneath the trochlearis. C, farther laterad. The fibers of the decussatio veilturn downward and forward as the tertiary gustatory tract. The radixmesencephalica passes caudad on the inner surface of the acusticum. X 16. Johnston, The Radix MesencephaUca Trigemini. 6ii or deep decussation of the cerebellum. This decussation in all sub-mammalian forms studied is the commissure of the nucleus visceraliscerebelli (secondary gustatory nucleus). The radix also runs beneaththe tractus tecto-cerebellaris, which I have identified in the selachians,
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