. The Journal of comparative neurology and psychology. V Fig. 21. Human foetus, 42 cm. Transverse section through the trigeminalroots on the left side. The short heavy line at the left below is the outersurface of the pons, x, x, x indicate the ends of the motor bundles, where theyleave the section. All the fibers below and to the left from these are tinosa. In each section is seen a large bundle of sensory fibers pass-ing dorsad over the outer surface of the sensory nucleus. A part ofthe fibers enter that nucleus, the remainder seem to pass on to thecerebellum. 626 Journal of Com
. The Journal of comparative neurology and psychology. V Fig. 21. Human foetus, 42 cm. Transverse section through the trigeminalroots on the left side. The short heavy line at the left below is the outersurface of the pons, x, x, x indicate the ends of the motor bundles, where theyleave the section. All the fibers below and to the left from these are tinosa. In each section is seen a large bundle of sensory fibers pass-ing dorsad over the outer surface of the sensory nucleus. A part ofthe fibers enter that nucleus, the remainder seem to pass on to thecerebellum. 626 Journal of Comparative Neurology and Psychology. The motor nucleus is indicated in Fig. 21 by a dotted line and inFig. 22 by the line along which the section was broken. Its dorso-lateral surface is covered, as in the younger specimen, by bundles ofthe motor root. On each side there is a broad but loose bundle ofdecussating fibers and beneath this are denser bundles of fibers arising Vmes. I flj V,. V mot nac / V sens Fifi. 22. Same specimen as in Fig. 21, two sections fartlier caudal on theright side, x 20. from the motor nucleus of the same side. The motor bundles runventro-cephalad and are cut obliquely in the section a short distanceventral to the lower border of the motor nucleus. The mesencephalic root of both sides is clearly formed of fibersfrom the sensory root and only obliquely crosses the motor bundles Johnston, The Radix Mesei^cephahca Trigemini. 627 as those pass downward and forward beneath it. In sections caudalto those shown in these figures the same relations maintain, exceptthat the mesencephalic bundle is more widely separated from themotor bundles in successive sections. It is seen in Fig. 21 that fiberspass out from the mesencephalic bundle to end in the sensory close relation of this bundle to the sensory nucleus is clearer inthe next sections caudad. Here it is distinctly seen that the mesen-cephalic bundle runs through the sensory nucleus and
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