THE CENTRAL COURSE OF THE NERVUS OCTAVUS. 201 



pag. 

 CHAPTER II. ON THE DISTRIBUTION ov THE NERVTJS OCTAVUS IN 



THE CENTRAL NERVOUS SYSTEM IN RABBITS .............. 45 



1. Methods of investigation. Introduction .............. 45 



2. The roots of the nervus octavus ................... 



a. The actual view upon the signification of the N. cochlearis and the 

 N. vestibularis and their continuation in the lateral and ventral root' ...... 48 



3. The primary systems or the root-fibres of the nervus octavus 



a. The fresh degeneration in the root-fibres taking place after the isolated 

 removal of the cochlea and the initial course of the dorsal (lateral) root in 



the central system ................................................. 53 



b. The fresh degeneration in the root-fibres taking place after the section 

 of the VIII th nerve and the initial traject of the ventral (medial) root in the 

 central system .................................................... 55 



c. The supposition that both roots send their fibres, though in different 

 quantities , in the same paths , is confirmed by the study of the myelinisation 



of the roots in the rabbit ........................................... 67 



d. The supposition that both roots send their fibres in the corpus trapezoides 



is also confirmed by GUDDEN'S method ............................... 59 



e. The systema ventrale nervi octavi ................................ 61 



/. The myelinisation-method offers the same results as the Marchi-method , 



in regard to the position of the root fibres and secundary fibres in the systema 

 ventrale nervi octavi ............................................... 64 



//. The secundary atrophy confirms the existence of i ootfibres in the systema 

 ventrale .......................................................... 67 



//. The most dorsally situated root-fibres and HELD'S intermediary system. 69 



/. The longitudinal rootfibres ascending towards cerebellum and metence- 

 plialon .......................................................... 73 



1. The rootfibres in the systema dorsale nervi octavi .................. 77 



m. The results of the secundary atrophy and of the myelinisation-method 

 in regard to the systema dqrsale nervi octavi .......................... 83 



//. The nucleus dorsalis nervi octavi ................................ 



o. The portio interna corporis restiformis ..... ....................... 



p. The portio interna in the embryo of the rabbit. Its atrophy after root- 

 section .......................................................... 97 



q. The descending octavusroot. The transverse dorsal fibres ............. 101 



4. The secundary systems of the nervus octavus ......... 105 



a. The secundary systems in the systema ventrale and in the 

 systema intermedium nervi octavi ................. ...... 



b. The longitudinal secundary systems from the systema 

 dorsale nervi octavi ................................. 



5. Summary of results ............................ 



The fibres of the dorsal root ...................... 130 



The fibres of the ventral root ....................... 133 



The ascending secundary systems .................... 135 



The descending secundary systems .................. 139 



