. The Journal of comparative neurology and psychology. ies ventral to the last, x 20. Descrip-tion in text. trapezoid body, etc. The motor bundles of the trigeminus are col-lected opposite the cephalic end of the motor nucleus, except thebundle z, which still receives decussating fibers and is closely relatedto bundle a of the mesencephalic root. The fibers of the h-c areahave now collected into two fairly distinct groups of small bundles c are evidently joining the sensory root and are inter-mingled with the fibers which are passing caudad in the spinal tri-geminal tract. The othe
. The Journal of comparative neurology and psychology. ies ventral to the last, x 20. Descrip-tion in text. trapezoid body, etc. The motor bundles of the trigeminus are col-lected opposite the cephalic end of the motor nucleus, except thebundle z, which still receives decussating fibers and is closely relatedto bundle a of the mesencephalic root. The fibers of the h-c areahave now collected into two fairly distinct groups of small bundles c are evidently joining the sensory root and are inter-mingled with the fibers which are passing caudad in the spinal tri-geminal tract. The other relations in this figiire will be clear fromthe labelling. 634 Journal of Comparative Neurology and Psychology. The following figures require little comment in addition to thedescription given beneath each. The sensory and motor roots nowrun on to their places of exit, the motor in front of the sensory. Ofthe motor root bundles, the one which is chiefly composed of decus-sating fibers, bundle z, lags behind the others, remains close to the Vmot Fig. 29. The third section of this series ventral to the last. X 20- Theheavy lines to the left mark the outer surface of the brain. Description in thetext. sensory root and leaves the brain as a separate rootlet in this the mesencephalic root the bundle c joined the sensory root inFig. 29, the bundle h enters the sensory root in Eig. 30, while thebundle a appears as three small compact bundles, the last of whichis seen joining the sensory root in Fig. 31. The relations of the Johnston, The Radix Mcsencephalica Trigcmmi. 635 spinal trigeminal tract, the cochlearis, the facialis and the trapezoidbody are dra^vn for the sake of orientation.
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