172 C. WINKLER. THE CENTRAL COURSE 



b ~ outer layer of those fibres, from which a part of the 



dorsal transverse fibres originate. 



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



nucl. dors. N. VIIT = nucleus dorsalis nervi octavi. 



Nucl. ventr. N. VIII nucleus ventralis nervi octavi. 



f. 1. p. =r fasciculus longitudinalis posterior, 



f. pr. d. = fasciculus praedorsalis. 



The dorsal root is degenerated at the left side. Thedistri- 

 bution of its degenerated fibres is described in Chapter II. 



Fig. 5. A frontal section through the medulla oblongata of a 

 foetal cat (just born) (treated with WEIGERT-PAL), at the 

 entrance of the nervus octavus. The myelinisated fibres 

 are blackened. The same indications are given as in fig. 1. 

 Moreover, there are found: 



c. trap. syst. ventr. a -~ Systema (ventrale) a in the corpus trapezoides. 



c. trap. syst. dors, b -~ Systema (dorsale) b in the corpus trapezoides. 



c. trap. syst. dors, c Systema (dorsale) c in the corpus tradezoider. 



syst. dors, d syst. intm. Systema (dorsale) d in the corpus trapezoides or the 



intermedia! system of the nervus octavus. 

 nucl. trap. nucleus trapezoides. 

 nucl. par. oliv. nucleus para-olivaris superior, 

 nucl. oL.sup. nucleus olivaris superior. 



N. VI rz abclucens-nerve. 



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

 fibr. rad. N. VII fibrae radiculares of the facial nerve. 



nucl. DEITEKS rr nucleus DEITEES. 

 Tr. DEIT. desc. = tractus DEITEKS descendens. 



Str. sup. tub. ac. -- stratum superficiale medullare tuberculi acustici. 

 r. sp. N. V. ramus spinalis of the nervus trigeminus. 

 h ~ str. int. fibres of HELD or the intermedial system of the ner- 

 vus octavus. 



PLATE II. 



Fig. 2. A frontal section through the medulla of a rabbit after 

 removal of the left cochlea , at the entrance of the ventral 

 octavus root (treated with Marchi-method). The extra- 

 medullar ventral root is free of degeneration. 



fasc. 1. p. ~ fasciculus longitudinalis posterior, 



genu N. VII =: genu nervi facialis. 



N. VII = radix nervi facialis. 



nunc. dors. = nucleus dorsalis 



r. desc. 



a. syst. interm. 



b. syst. dors, 

 nucl. ventr. 



r. dors, 

 r. ventr. 



radix descendens 



= systema intermedium 

 N. VIII -- systema dorsale 

 = nucleus ventralis 



radix dorsalis 



radix ventralis 



nervi octavi. 



n. gris. r. desc. nucleus griseus radicis descendentis. 

 str. nied. stria medullaris. 



