. The Journal of comparative neurology and psychology. etters a, h and c standat the angles of a triangle which includes the fibers of the mesen-cephalic root and nearly all the fibers appearing within this trianglebelong to that root. All these fibers are clearly traced in the inter-mediate sections. It is probable in this and the following sectionsthat a few of the fibers in the a-h-c area end in the sensory nucleus, Johnston, The Radix Mcsencephalica Trigemini. 633 for as Fig 28 clearly shows, the mesencephalic root is runningdirectly through the sensory nucleus. There now appears in thisse
. The Journal of comparative neurology and psychology. etters a, h and c standat the angles of a triangle which includes the fibers of the mesen-cephalic root and nearly all the fibers appearing within this trianglebelong to that root. All these fibers are clearly traced in the inter-mediate sections. It is probable in this and the following sectionsthat a few of the fibers in the a-h-c area end in the sensory nucleus, Johnston, The Radix Mcsencephalica Trigemini. 633 for as Fig 28 clearly shows, the mesencephalic root is runningdirectly through the sensory nucleus. There now appears in thissection the most dorsal portion of the main sensory root of thetrigeminus, just at the point where it is giving fibers to the sensorynucleus and where the most of its fibers are turning caudad as thespinal trigeminal tract. There also appear in the figure the root ofthe vestibularis and of the motor facialis. In Fig. 29 appear besides the sensory and motor roots and nucleiof the trigeminus, the motor facialis, the cochlearis, fibers of the - ,. Fig. 28. The fourth section of this series 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 co
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