124 0. WINKLER. THE CENTRAL COURSE 



verse fibres are naerly the same as the above mentioned. At their 

 origin from the degenerated mass of dorsal fibres, it cannot well 

 be judged whence MONAKOW'S fibres come, but as the DEITKRS 

 tract has loosened itself from this mass and crossed the facial root, 

 a great many fibres issue from it in order to give an important 

 number of fibres in MONAKOW'S system. 



In horizontal sections (Plate XVII fig. 20 E) this is easily demon- 

 strated. Some of those fibres even bend proximally and , after having 

 crossed the raphe , may again reach the medial bundle of the lateral 

 fillet. The larger part follow the usual path of the MONAKOW fibres. 



Therefore it appears , that the fibres issued from the large cells 

 of the tuberculum acusticum , do not only follow the direct way into 

 MONAKOW'S decussation to reach the dorsal layer of the oliva 

 superior and from there the medial layer of the fillet, but that 

 they also enter in both tracts of DEITEBS and remain there for a 

 longer or shorter extension till they find , by means of a decussatio 

 ventral from the fasciculus longitudinalis posterior , a direct way 

 to this bundle. In this way the tub. acustic. may aid to the archi- 

 tecture of the DEITERS tract, and the nucleus of DEITKRS, to that 

 of the MONAKOW system to the lateral fillet. 



Now leaving those tracts, still other important layers of degene- 

 rate fibres after the section of the dorsal systema ask a description. 



I 1y in following the (degenerate) descending root, it appears that 

 the layer of normal longitudinal fibres found after rootsection 

 medially from the (degenerate) rootfibres (Plate V fig. 9 and fig. 10) 

 between this root and the nucleus dorsalis N. octavi shows also 

 degeneration (Plate XVI fig. 20 D). Subsequently this descendent 

 tract , accompanying the descending root , intensely degenerated , 

 may be traced very far distal ward , constinuing with a part of its 

 fibres in the fasc. solitarius N. vagi (Plate XVII fig. 20 E) and 

 (Plate XX fig. 25 H) found there situated dorsally. 



From this tract part an innumerable quantity of small collaterals 

 perpendicular to its direction (Plate XVI fig. 20 D) ending in 

 the nucleus N. VI, now totally blackened with black globules, 

 in the nucleus dorsalis N. VIII, in the nucleus N. X and in the 

 same-sided nucleus N. XII, The XII th nucleus however is only very 

 slightly connected with the secundary octavus-fibres , at least in a 

 far less intensity than the upper part of the spinal cord. In this 

 way as till now is demonstrated , there is only one motor nucleus, 

 that of the V th nerve, having no relation with them. Only not 

 all are degenerated with the same intensity. The most interested 

 nuclei at the operated side are : 



