54 C. WINKLER. THE CENTRAL COURSE 



layer of the corpus restiforme has increased and moreover they are lying 

 in the inner part of this layer close to the corpus restiforme, where 

 degenerated fibres are not found after the isolated removal of the 

 cochlea (see fig. 4 on Plate IV). 



The common opinion that the stratum latero-dorsale of the corpus 

 restiforme is only formed by the root-fibres of the cochl ear-nerve 

 is incomplete. 



In fact the greater part of the lateral rootfibres continue their 

 course in this stratum latero-dorsale corporis restiformis - - as frontal 

 sections through the medulla oblongata, touching the fibres of this 

 layer longitudinally, demonstrate easily -- but this stratum receives a 

 considerable a ceres from fibres of the medial root. LEWANDOWSKY is 

 right in this opinion. 



With the Marchi-niethod it is easy enough , to follow the degene- 

 ration after the removal of the cochlea - - the black granuled fibres 

 of the lateral root -not only in the stratum latero-dorsale but 

 also in other paths. 



As soon as the degenerated dorsal root-fibres have reached in 

 that case the medulla oblongata they divide into three portions. 



1. Some fibres leave the dorsal (lateral) root rectangularly in a 

 ventral direction and passing directly in the corpus trapezoides may 

 be followed across the raphe (see fig. \a Plate I and Plate II fig. 2). 



They are the root-fibres of the dorsal root , that are to partici- 

 pate in the formation of the ,,systema ventrale of the nervus octavus". 



2 C A few fibres especially in the proximal region of the 

 entrance of the lateral root enter between the oval area of the 

 corpus restiforme and the spinal root of the V lh nerve. They reach 

 the portio interim of the restiform body. They form the most 

 distally situated fibres among those, who are found between oval 

 area and spinal root of the N. V. and bear themselves as the greater 

 part of the root-fibres of the ventral (medial) root do (see fig. 2 on 

 Plate II). They are the medial fibres of the dorsal root. This medial 

 trunk of dorsal rootfibres is not very important. 



3 e . The greater part of those fibres pursue their way in a dorsal 

 direction. Closely joined together, they penetrate through the nucleus 

 ventralis nervi VIII , dividing it into a smaller medio-ventral , and 

 a larger latero-dorsal part and reach the stratum latero-dorsale. 



There they pursue their course, at first between nucleus ventralis 

 and the oval area of the restiform body, afterwards between the 

 tuberculum acusticum and the oval area. So they describe a cur- 

 vature round the oval area , closely adossed to it in its ventro-distal 

 part (see fig. \a on Plate I), but as they advance dorsally and 



