94 C. WINKLER. THE CENTRAL COURSE 



go through the nucleus of DEITERS to the medio-ventral part of the 

 portio interim in the descendent radix. 



In this way the radix descendens contains different root-fibres. 

 For the greater part they are fibres of the medial trunk origina- 

 ting in the ventral root. Some fibres nevertheless, reach it through 

 the dorsal systema. They again are mostly fibres of the ventral root 

 passing through the oval area. But some fibres of the dorsal root 

 also attain the descendent radix by the two described paths, l' y as 

 medial fibres of the dorsal root. 2 ly round the oval area. 



After rootsection however degenerated fibres are found not only 

 in the ventro-medial quadrant of the portio interim. 



After rootsection the degenerate fibres in the stratum latero- 

 dorsale are augmented, most in the inner layer, but also in the 

 outer layer. They partly are ending in the lateral cells of the dor- 

 sal nucleus. But a rather important bundle goes on the latero- 

 ventral border of this nucleus, through the cells of DEITERS, be- 

 tween this nucleus and the portio interna. As this bundle reaches 

 the ventral apex of the dorsal nucleus, there, where it touches the 

 nucleus griseus of the descendent root, it participates to the trans- 

 versal fibres of this region, changing its direction into a medial one 

 and going along the ventral border of the principal group and of 

 the nucleus N. VI, it reaches the raphe. 



These are the transverse fibres of the systema dorsale n. octavi". 

 Their number is increased by fibres of the medial trunk, there 

 where it sends distally the greater mass of its fibres into the des- 

 cending root, but they are not only fibres of the ventral root. 



For after removal of the cochlea there are also found degenera- 

 ted fibres in the transverse fibres of the dorsal systema. 



Knowing now the degenerate fibres after root-section in the 

 portio interna I am enabled to reconstruct the systema dorsale nervi 

 octavi, where I left it. 



This systema, by MARcm-degeneration , has been divided in three 

 layers, whilst it was contained in the stratum latero-dorsale. 



An outer layer of degenerate root-fibres, a middle layer of 

 normal fibres, and an inner layer again of degenerate root-fibres, 

 radiate together towards the stria acustica. 



But this dorsal system contains at least five bundles. 



l e dorsal rootfibres (from the two roots) to the lateral cells of 

 the dorsal nucleus. 



2 e dorsal rootfibres (from the two roots) to form dorsal trans- 

 verse fibres. 



3 e secundary dorsal transverse fibres. 



