1492 



A MANUAL OF ANATOMY 



Vestibular Nerve. — ^The terminal nuclei of the vestibular nerve, 

 which is the nerve of equilibrium, are three in number — ^namely, 

 (i) the dorsal or principal nucleus, (2) the descending nucleus, and 

 (3) the nucleus of Deiters, associated with which there is the nucleus 

 of Bechterew. 



6 14 



-^^^ 



Z 



Fig. 621. — Terminal Nuclei of the Cochlear Nerve, with their Supe- 

 RioR Connections (Schematic) (L. Testut's ' Anatomie Humaine '). 



(The vestibular root and its terminal nuclei, with the efferent fibres of these 

 latter, have been suppressed. In order not to obscure the trapezoid body, 

 the efferent fibres of the terminal nuclei of the right side have been in a great 

 part of their extent resected. The trapezoid body is consequently composed 

 of only half of its fibres — namely, those which come from the left). 



6". Crossed Fijjres of the Striae Acusticae going 

 to the Superior Olivary Body of the oppo- 

 site side 



7. Superior Olivary Body 



8. Corpus Trapezoides . 



9. Trapezoid Nucleus 



10. Lateral Fillet 



11. Raph6 



12. Pyramidal Tract 



13. Fourth Ventricle 



14. Inferior Peduncle of Cerebellum (Restifom 

 Body) 



The dorsal or principal nucleus is situated in the floor of the fourth 

 ventricle underneath the area acustica and strice acusticcB. The 

 descending nucleus is continuous with the lower end of the dorsal 

 nucleus, and it accompanies the descending fibres of the vestibular 

 nerve into the medulla oblongata. The nucleus of Deiters is 

 situated external to the dorsal and descending nuclei, and the 



1. Vestibular Root of Auditory Nerve 



2. Cochltar Root 



3. Accessory Nucleus of Auditory Nerve 



4. Lateral Nucleus, or Tuberculum Acusticum 



5. Efferent Fibres of Accessory Nucleus 



6. Efferent Fibres of Lateral Nucleus, forming 



the Striae Acusticae 

 6'. Direct Fibres of the Striae Acusticx going to 

 the Superior Olivary Body of the same 

 side 



