OF THE NERVUS OCTAVUS. 177 



b. ~ its dorsal (principal or central) group of cells. 



c. =: its lateral group of cells. 



d. n; its ventral group of cells. 



e. the nucleus nervi abducentis. 

 n. DEITERS = nucleus of DEITERS. 



n. griseus r. desc. nucleus griseus radicis descendentis nervi octavi. 



tub. ac. ~ tuberculum acusticum. 



n. ventr. N. VII [ nucleus ventralis nervi octavi. 



r. ventr. N. VIII radix ventralis nervi octavi. 



r. N. VII r= radix nervi facialis. 



genu N. VII genu nervi facialis. 



N. V. = spinal root of the nervus trigeminus. 



n. prop. n. ventr. N. VIII nucleus proprius radicis ventralis nervi octavi. 



PLATE VIII and PLATE IX. 



Fig. 15. N. 1 N. 16. A series of frontal sections from the 

 beginning of the medulla oblongata until the corpora 

 quadrigemina anteriora in a rabbit, three weeks after the 

 removal of the left labyrinth -[- the section of the left 

 nervus octavus. (Treated with MAncm-method). The root 

 of the V th is touched by the section. 



The drawings are representing. 

 N. 1 =r the section through the medulla oblongata before the distal end of 



the ventriculus IV. 

 N. 2 idem through the medulla oblongata at the distal opening of the 



ventriculus IV. 

 N. 3 idem, as the dorsal ascending spino-cerebellar tract (FLECHSIG'S 



Klein-Hirn-Seitenstrangbiindel) changes its place and the area ovalis 



of the C. R. begins. 

 N. 4 -- idem, through the nuclei N. XII, the transparent nucleus N. X, 



the dorsal nucleus of the N. VIIE and the distal end of the nucleus 



of DEITERS. 

 N. 5 = idem, proximal from the nucleus N. XII, at the distal end. of the 



nucleus N. VII. 



The descending octavus-rootfibres, degenerated inthese 



o * *-? 



sections, are described in Chapter II of the paper. 



N. 6 = idem, through the distal end of the tuberculum acusticum. 



N. 7 = idem, through the entrance of the distal (dorsal) root of the nervus 



octavus, showing its direct rootfibres to the medial nuclei tecti. 

 N. 8 =: idem, through the nucleus ventralis nervi octavi, with the fibrae 



perforating the oval area of the ventral root. 



N. 9 idem, through the proximal (ventral) root of the- nervus octavus. 

 N. 10 r= idem, through the nucleus of BECHTEREW, and the issue of the 



VII th nerve. 

 N. 11 r= idem, through the corpus trapezoides, showing its degeneration and 



through the degenerate fasciculus spino-cerebellaris ascendens ventralis, 



free at the surface of the lateral fillet. 



N. 12 zr idem, through the issue of the nervus trigeminus. 

 N. 13 idem, through the distal end of the corp. quadigerninum posticum. 



Verhand. der Ron. Akad. v. Wetensch. (Tvveede Sectie.) Dl. XIV. 12 



