72 C. WINKLKR, THE CENTRAL COURSE 



an important one , represented in it. A total degeneration of its 

 fibres may only be brought about, after sectioning it at the dorsal 

 border of the oval area. It is never found after root-section (to 

 compare fig. 25. II on Plate XX). 



It has been controversed , for instance by LIWANDOWSKY, that 

 the rootfibres here mentioned , should enter in the nucleus of the 

 VII th nerve. I must, as regards this, be on the side of HELD. 

 The fibres of the intermedia! system enter in the dorsal border of 

 the facial nucleus of the same side , as well as those of the ven- 

 tral system enter it at the ventral border. But the greater number 

 of them ends in the dorsal border of the oliva superior at the same 

 side, and after having passed the Raphe in that of the opposite oliva. 



In this way, the interinedial system provides with fibres the 

 dorsal borders of the ventral teginenturn-nuclei , whose ventral , 

 lateral and medial borders are provided by the ventral system of 

 the VIII th nerve. 



k. The longitudinal root-fibres of tJte ventral and intermedial systema 



ascending towards the cerebellum and towards the meseiicephaloii. 

 Their situation in the lateral lemniscus. Their endings in the nuclei 

 tecti cerebelli and in the nucleus of the corpus quadrigeminwn posticum. 



As soon as the root-fibres of the interinedial system and those 

 of the ventral system have met in the medullary field between the 

 spinal quintus-root and the facial nucleus (respectively the superior 

 olivary body) a small quantity of them deviate in longitudinal 

 direction to form ascending and descending tracts, which now ask 

 our attention. They contain rootfibres in a relative small quantity, 

 still enough to be demonstrable, but they have a great importance, 

 because they accompany important other secundary systems, taking 

 the same course. 



It is since long known , that in the foetal medulla oblongata , 

 frontal sections may demonstrate between the spinal root of the 

 V th nerve and the facial nucleus or the olivary body a triangular 

 field of queer-sectioned medullated nerve-fibres, that has obtained 

 several names. It chiefly contains spinal fibres, which are situated 

 there in the antero-lateral tract of GOVVERS , and so this name is 

 transferred to the field in the oblongata. Better it is to call it the 

 ventral and ascending spino-cerebellar tract (the dorsal ascending 

 spino-cerebellar tract being represented by FLECHSIG'S Klein-IIirn- 

 Seitenstrangbahn). This triangular medullated field found for a short 

 time in the lemniscus lateralis, (Plate XII. fig. 17 A, B and C, 



