OF THE NEHVUS OCTAVUS 75 



to the bracchium pontis. To these fibres new ones are joined from 

 the stratum latero-dorsale , and together they form the degenerated 

 area , that may be traced (Plate XIV fig. 1 4 B and in Plate XIV 

 fig. 14 C in 1.1. and f. sp. c. v. a.) to the most lateral and super- 

 ficial stratum of the lemniscus , separated from the pedunculus 

 cerebelli superior by the nucleus dorsalis lemnisci. More dorsall < y 

 (Plate XV fig. 14 D and E in f. sp. c. v. a.) they leave the 

 lateral lemniscus, pass dorsally from the peduncle and reach the 

 nuclei tecti cerebelli niediales. 



As it is demonstrated these fibres pass on their way the two 

 nuclei lemnisci , and it is not easy to say whether they enter in 

 those nuclei. 



As for the nucleus ventralis lemnisci the fibres surround it at 

 its lateral, ventral and distal border, but as the number of dege- 

 nerated nerves here even after rootsection is always small , I dare 

 not say that they enter in this nucleus. I believe them to do so 

 because after sectioning the tuberculum acusticum (as well as after 

 luMnisection of the lower part of the medulla oblongata) they cer- 

 tainly do. 



As for the nucleus dorsalis lemnisci the question stands other- 

 wise. The fibres pass this nucleus at its lateral border, but send 

 no collaterals in this nucleus. In this way root-fibres of the ventral, 

 interrnedial (but also from the dorsal systeina) nervi octavi, reach 

 the nuclei tecti of the cerebellum, in the ,,fasciculus ascendens 

 ventralis spino-cerebellaris". 



But after root-section other fibres in the lateral fillet are brought 

 to degeneration. They may be traced into the nucleus of the cor- 

 pus quadrigeminum posticum (Plate VIII fig. 15 N. 12, Plate 

 IX fig. 15 N. 1316). 



In frontal sections they also are found between the spinal root 

 of the V th nerve and the oliva, they also bend dorsally into the 

 lateral lemniscus , near the departure of the V th nerve , (but in a 

 somewhat more proximal region as those , which enter in the cere- 

 bellar tract) and form there the medio-ventral surroundings of the 

 nucleus ventralis lemnisci. Having left some fibres in this nucleus, 

 they continue their dorsal direction (Plate IX fig. 15 N. 15). In 

 the lateral fillet they reach the nucleus of the corp. quadrigeminum 

 posticum , embracing it at its ventral pole. 



Studied in horizontal sections these fibres may be likewise demon- 

 strated. As long as the ventral regions of the medulla are concer- 

 ned , they are not separated from the fibres going to the nuclei 

 tecti (Plate X fig. 16 E--I). In more dorsal sections they become 



