184 C. WINKLER. THE CENTEAL COURSE 



Fig. 25 E. The section touches at the right side the lesion. The pedunculus cerebelli 

 inferior (its oval area) being cleft , this oval area is degenerating towards 

 the cerebellum. Transverse fibres unite the two ascending DEITERS tracts. 

 The medial bundle of the fillet touches the lateral bundle at the dorsal 

 top of the distal end of the nucleus ventralis lemnisci. The systema ven- 

 trale nervi octavi is degenerated. 

 Plate XX. 



Fig. 25 F. The section touches the lesion in x on both sides. Degenerated are l j y the 

 fasciculus longitudinalis posterior 2 l y the tractus PEITERS ascendens. 3'y 

 MONAKOW'S decussation of transverse fibres going to the dorsal layer of 

 the oliva superior (medial bundle of the fillet). 4^ The systema ventrale 

 nervi octavi. 



Fig. 25 G. The section touching still in x the double-sided lesion falls tli rough 

 the exit of the VII th nerve. 



MONAKOW'S transverse fibres towards the dorsal top of the nucleus 

 olivaris superior are totally degenerate. 



Fig. 25 H. The section touches the tuberculum acusticurn and the nucleus ventralis. 

 Degeneration is found in. 1'y. The systema dorsale (MONAKOW'S stria rnedul- 

 laris). 2'y. HELD'S intermedial system, b'y. The tractus DEITERS descen- 

 dens. 4'y. The systema ventrale. 



Fig. 25 I. The section touches the nucleus facialis and the distal end of the tuber- 

 culum acusticurn. On both sides is found degeneration in 1^ the tractus 

 DEITERS descendens. 2'y. The fasc. long. post, and the fasciculus praedor- 

 salis , 3*y in the fasc. rubro-spinalis 4'y in the nucl. facialis , 5'y in the fibr. 

 transversae dorsalis and 6'y in the radix descendens N. VIII. 



Fig. 25 K. The section falls through the XII th nucleus, demonstrating the degene- 

 ration in the tracts descending towards the cord. 



Fig. 25 L. The section through the distal end of the med. oblongata. The position 

 of the tractus DEITERS descendens, the fasciculus praedorsalis and the 

 rubrospinal tract. 

 PLATE XXI. 



Fig. 25 M N and o. Sections through different levels of the cervical cord (Cj , C 2 , C 3 ) to 

 demonstrate the position of the f. praedorsalis , the descending DEITERS 

 tract , and the rubro-spinal tract. 



PLATE XXI and PLATE XXII. 



Fig. 28 A F and fig. 12. Series of sections through the medulla 

 oblongata of the rabbit, six months after the ablation 

 of the left tuberculum acusticum made in the young born 

 animal. The lesion is found in fig. 28 in A D. The 

 nucleus ventralis is ablated, but the octavus-roots have 

 but a slight atrophy. The series is drawn to demonstrate 

 the atrophy of the systems in the fillet. (Wr.iGERT-PAL 

 preparation). 



PLATE XXI. 



Fig 12. A part of the section in fig. 28s, limited by a circle, is drawn by an 

 enlargement of 150 /i. The nucleus ventralis and the larger part of the 

 corpus trapezoides being lost, it is seen, that fibres of the octavus-root 

 (the dorsal root) pass immediately into the corpus trapezoides. 



Fie;. 28 A. The section through the distal end of the tub. acusticum. 



