130 C. WINKLER. THE CENTRAL COURSE 



C. R. , some fibres into the ventral trunk , but an important number 

 of its fibres are by means of an intermediary bundle, directly or 

 through the corpus restiforme, introduced into the dorsal trunk. In this 

 way the course of the two roots does differ very much as to the 

 quantity of the fibres, directed into the different trunks, but there 

 are no paths, followed by one of them, wherein no fibres of the 

 other appear. 



Their course may now be illustrated by the adjoined schemata. 



THE FIBRES OF THE DORSAL ROOT (cochlear-fibres). 



(Schema A). 



Most fibres of the dorsal root enter in 



I. THE DORSAL TRUNK (stratum latero-dorsale corporis restiformis). 

 Those fibres perforate the ventral nucleus N. VIII and leave 



1. a great many fibres in the disto-ventral part of the ventral 

 nucleus. 



Between the larger cells of this nucleus from which secun- 

 dary systems originate - - and the rootfibres, small cells are inter- 

 calated (the nucleus proprius radicis dorsalis) and also 



2. many fibres in the dor so-proximal part of the ventral nucleus, 

 After the perforation they form the external layer of the stratum 



latero-dorsale C. R. the beginning of THE SYSTEMA DORSALE NERVI 

 OCTAVI. They divide into many bundles, radiating dorsally from the 

 area ovalis C. R. 



3. the dorsal rootfibres in the stratum medullare profundum tuber- 

 culi acustici. 



From these rootfibres perpendicular collaterals enter in this nucleus 

 and with the aid of small intercalated cells (in .the stratum profundum 

 griseum) the large radially situated cells are innervated - - from 

 which secundary systems originate. 



4. the dorsal rootjibres to the lateral part of the dorsal nucleus 



N. FIII. 



Collaterals end therein. The small cells therein may intercalate 

 them to the nucleus of DEITERS. 

 Less in number but evident are : 



5. the dorsal rootfibres among the system of dorsal transverse fibres. 

 They are much increased by ventral root-fibres. Only a few fibres go 

 a. ventrally from the dorsal eighth nucleus to the VI th 



remaining in those nuclei. On this way very few are going. 

 (3. to the formatio reticularis (descendent DEITERS tract}. 



