102 C. WINKLER. THE CENTRAL COURSE 



faso. solitarius, but in frontal sections (Plate VIII fig. 15N. 5 1) 

 there appears only a scanty number of them. As far as the field 

 of separated bundles may be traced, that is to the proximal 

 ends of the nucleus of BuuDAcn-MoNAKOW a few degenerated fibres 

 are seen. They probably provide the nucleus proprius of the resti- 

 form body till its most distal end. 



Now the endings of the systema dorsale of the nervus octavus 

 still remain to describe. 



From this I have already demonstrated the intermedial system and 

 found that it transported fibres from the dorsal system through the 

 ventral ascending spino-cerebellar tract into the nuclei tecti and 

 through the crossed lateral fillet to the corp. quadrig. postic. These 

 two ascending tracts need here no farther description. 



It only must be kept in mind, that in proximal sections, fibres 

 of the ventral root continue in the ascending root and go directly 

 to the nuclei tecti, without using the complicated way dictated by 

 the ventral ascending spino-cerebellar tract. 



But after having lost the intermedial system and the fibres to 

 the descending root, the dorsal systema bends as transversal dorsal 

 fibres between the dorsal nucleus and the portio interim. Arrived 

 at the ventral apex of this nucleus or near to it, some dege- 

 nerate fibres leave the dorsal systema and enter the formatio 

 reticularis. 



The most lateral of them following the edge between the V th 

 spinalroot and the nucleus of the VII th nerve , reach there the field 

 situated dorsally from the antero-lateral (GowERs) tract, bend distally 

 into the longitudinal axis of the medulla and give collaterals in 

 the direction of the VII th nucleus, (see fig. la on Plate I and fig. 

 15 N. 11 on plate VIII). They reach a field, known as the ,,aber- 

 rirendes Seitenstrangbiindel, or as MONAKOW'S bundle, or as fasciculus 

 rubrospinalis, or even as the dorsal descending spino-cerebellar (?) tract, 

 that soon will claim a discussion. As soon as distal ward the facial 

 nucleus has disappeared , there may be found in frontal sections some 

 black granules, more than usually (Plate VIII fig. 15 N. 4) and 

 in horizontal sections very few degenerate fibres medially from the 

 spinal V th root between it and the facial nucleus. But here Marchi- 

 method reaches its limits. It only is interesting because afterwards 

 we will have to discuss the question to what extent secundary 

 fibres pass along this way towards the spinal cord. 



More interesting are the fibres entering more medially into the 

 formatio reticularis, and seeking dorsally from the facial nucleus 

 the region, where the descending tract of DEITERS or the fasciculus 



