OF THE NERVUS OCTAVUS. 175 



Fig. 9. This section touches the entrance of the ventral root and 

 its division in a descending and in an ascending root. 



Fig. 10. This section touches more dorsally the bracchium con- 

 junctivum of the peduncuhis cerebelli superior and its 

 entrance in the mesencephalon. 



(Both preparations are treated with Marchi-method). 



R. dors. N. VIII rr radix dorsalis nervi octavi. 



P. ventr.-dist. n. ventr. N. VJII = portio ventro-distalis nuclei ventralis nervi octavi. 

 H rr f. int. -|-r. dors, ad r. ventr. = H ELD'S intermediary system -|- fasciculis inter- 



medius dorsalis ad radicem ventralem. 

 P. dors. lat. n. ventr. N. VIII portio dorso-proximalis nnclei ventralis nervi 



octavi. 



ar. ov. C. R. = Area ovalis corporis restiformis. 

 N. sens. N. V. nucleus sensorius nervi trigemini. 

 Pes. cer. ad. pont. Pes cerebelli ad pontem. 

 Nucl. ventr. lemn. 1. =r nucleus ventralis lemnisci lateralis. 



L. L. ~ lemniscus lateralis. 



nucl. gris. r. desc. N. VIIE. z= nucleus griseus radicis descendentis nervi octavi. 

 N. Dors. N. VI II nucleus dorsalis nervi octavi. 



N. DEITERS nucleus DEITEES. 

 Sjst. dors. N. VIII systema dorsale nervi octavi. 

 nucl. Mot. N. V nucleus motorius nervi trigemini. 



form. ret. lat. Area lateralis of the formatio reticularis. 



f. 1. p. ~ fasciculus longitudinalis posterior. 

 N. DARK. nucleus DAKKSCHEWITSCH. 

 Corp. restif. corpus restiforme. 

 N. BECHTEREW rr nucleus BECHTER.EW. 

 Tr. DEITERS asc. = Tractus BETTERS ascendens. 

 r. desc. N. VIII radix descendens nervi octavi. 

 L. L. ad c. q. p. Lemniscus lateralis ad corpus quadrigeminum 



posticum. 



N. dors. L. L. nucleus dorsalis lemnisci lateralis. 

 Ped. cer. sup. pedunculus cerebelli superior. 



PLATE VI. 



Fig. 19 A. B. Sagittal sections through the medulla of a not yet 

 born rabbit near the entrance of the octavus-roots. 

 (WEIGERT-PAL preparations). 



r. N. V radix nervi trigemini. 

 r. N. VII radix nervi facialis. 



A. prox. (ventr.) N. VIII ~ radix proximalis (ventralis or medialis) nervi octavi. 

 r. dist. (dors.) N. VIII =: radix distalis (dorsalis or lateralis) nervi octavi. 



f. interm. rad. intermedial rootlet going from the proximal to the 



distal octavus root, 

 c. trap. corpus trapezoides receiving fibres from the distal and 



from the proximal root als well as from the. 

 n. ventr. N. VIII nucleus ventralis Nervi octavi. 

 tub. ac. tuberculum acusticum. 



