72 LABORATORY OUTLINE OF NEUROLOGY 



is not easily identified in this region, locate it in sections at the 

 level of the upper border of the pons and trace it back to the 

 superior olive. In sections through the midbrain the lateral 

 lemniscus can readily be followed to its terminations in the 

 medial geniculate body and inferior colliculus, and the fibers from 

 the later to the medial geniculate body in the brachium of the 

 inferior colliculus are also easily identified. Diagrams illus- 

 trating the connections of the cochlear nuclei with other centers 

 of the brain are given in many texts. See Bailey ('16), Fig. 

 338, p. 500; Herrick ('15), Fig. 96; Morris ('14), Fig. 650, p. 

 824; Rauber-Kopsch ('07), Fig. 684, p. 620; Villiger ('12); Fig. 

 165, p. 179. 



83. Nervus vestibularis and its nuclei. — Locate in your micro- 

 scopic sections and draw the vestibular root of the VIII nerve 

 and its nuclei (see Section 62 (5) and (6)), viz.: 

 Nucleus n. vestibuli superior (of Bechterew). 

 Nucleus n. vestibuli lateralis (of Deiters or nucleus vestibu- 

 laris magnocellularis). 

 Nucleus n. vestibuli medialis (of Schwalbe, also called nucleus 

 dorsalis, principal nucleus, and nucleus vestibularis tri- 

 angularis) . 

 Nucleus n. vestibuli spinalis. 



The fibers of the vestibular root pass inward beneath the 

 inferior cerebellar peduncle (restiforme body) and at right 

 angles to its fibers. The vestibular nuclei lie in the floor of the 

 fourth ventricle medially of the restiform body (Herrick ('15), 

 Figs. 86 and 96). All of these nuclei (especially the nucleus 

 medialis) send fibers into the reticular formation of the same 

 and the opposite side for motor reflexes of the oblongata. Find 

 in these sections, if possible, the fibers which pass from the ves- 

 tibular root and nucleus to the restiforme body and thence into 

 the cerebellum — the cerebellar root of the VIII nerve and the 

 vestibulo-cerebellar tract. These fibers pass directly dorsalward 

 from the upper end of the vestibular nuclei (see Herrick ('15), 

 Fig. 86) and join the restiform body on its medial side. Identify 

 also the vestibulo-spinal tract, passing toward the spinal cord 

 from the lateral and spinal vestibular nuclei. It can be followed 

 downward through the series of sections, lying in the angle be- 

 tween the restiform body and the dorsal vagal nuclei (see Her- 



