. The Journal of comparative neurology and psychology. er the relations more clear, I havedrawn the same section at a higher magnification so as to be able toshow the exact position of the fibers of bundle a more clearly (). Every fiber is drawn under the camera with great care. I amunable to find a single fiber of the mesencephalic bundle which seemsto turn into the motor bundles. 632 Journal of Comparative Neurology and Psychology. Above and below the section just described the relations of bundlea are entirely clear. Proceeding with the series, Fig. 28 ^3hows thefull extent of the mot
. The Journal of comparative neurology and psychology. er the relations more clear, I havedrawn the same section at a higher magnification so as to be able toshow the exact position of the fibers of bundle a more clearly (). Every fiber is drawn under the camera with great care. I amunable to find a single fiber of the mesencephalic bundle which seemsto turn into the motor bundles. 632 Journal of Comparative Neurology and Psychology. Above and below the section just described the relations of bundlea are entirely clear. Proceeding with the series, Fig. 28 ^3hows thefull extent of the motor nucleus and all of the motor bundles nucleus is pear-shaped with the small end caudad. A few decus-sating motor fibers are seen passing over this small part of thenucleus to join the bundle z which receives also fibers from this partof the nucleus. The bundle ij is also a mixed bundle of decussatingand homolateral fibers. From the large cephalic part of the nucleusare being formed the remaining motor bundles which are marked Vmot riuc \. ^mot cr Fig. 27. Same as in Fig. 2G. x ^^- Description in text. V, w and x. Between the bundles x and y are seen the curving fibersof the bundle a of the mesencephalic root, just extricating themselvesfrom the motor bundle x. Lateral to the bundle a are seen the fibersof the bundle h-c, now loosely scattered. The letters 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 th
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