424 JOHN H. STOKES 



lower portion of the olivo-cochlear tract is conspicuous, and the 

 contribution of the ventral nucleus to the dorsal path by way of 

 this bundle is well shown. The principal origin of the tract in 

 the tuberculum is more posterior, but is shown quite as satis- 

 factorily in sagittal section (fig. 13). The corpus trapezoideum 

 appears from origin to decussation. The origin in the substance 

 of the ventral nucleus and the button-holing with the entering 

 strands of the vestibular root are well shown. The lateral half 

 of the bilobed superior olive and the termination of the ventral 

 end of the olivo-cochlear tract in connection with it, can be better 

 made out in the sections themselves, owing to the impossibility 

 of doing justice in pen and ink work to the whorls and coils of 

 delicate fibrils which give the nucleus a characteristic appearance. 

 The posterior end of the medial half is just suggested and with 

 the nucleus corporis trapezoidei appears to better advantage in 

 the next section. The division of the decussation into a dorsal 

 and a ventral part, the dorsal apparently concerned largely with 

 fibers from the olives, and the ventral a more direct long-path 

 decussation, can be well made out. The fibers of the sixth nerve 

 should not be confused with olivary connections in this section. 

 As regards the vestibular, the distribution of the main mass of 

 fibers direct to the region of the spinal tract, along its ventral 

 surface is apparent. Deiter's nucleus, with its large ganglion 

 cells, easily the largest in this part of the brain, looms up, a 

 conspicuous landmark in the field, above and medial to the divi- 

 sion of the entering strands. The medial part is easily made 

 out in this section. The most posterior strands of the nucleo- 

 cerebellar tract of the vestibular nerve are also seen, and the 

 dense strands cut at an angle which represent the more anterior 

 fasciculi of the same tract as they bend back towards the more pos- 

 terior parts of the nucleus fastigii. The restiform body in its 

 groove on the outer side of the nucleo-cerebellar tract, stands out 

 clearly. On the medial side in the roof of the ventricle, the charac- 

 teristic appearance and relations of the vestibular decussation, 

 especially its independence of the corpus restiforme, are apparent. 

 Of the medial vestibular nucleus, nothing but the anterior tongue- 

 like mass of fibers and grey matter lateral to the olivo-cochlear 



