1490 



A MANUAL OF ANATOMY 



consequently take different courses. The cochlear nerve passes 

 round the outer side of the restiform body, whilst the vestibular 

 nerve passes backwards on the inner side of that body, and each 

 root has special terminal nuclei. 



Cochlear Nerve. — ^The terminal nuclei of the cochlear nerve, 

 which is the nerve of hearing, are two in number — ^ventral and 

 lateral. 



The ventral or accessory nucleus lies on the ventral aspect of the 

 restiform body, between the cochlear and vestibular nerves. The 



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Fig. 620. — Terminal Nuclei of the Vestibular Nerve, with their 

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



I. Cochlear Root, with its Two Nuclei 

 2 Accessory Nucleus 



3. Lateral Nucleus, or Tuberculum Acusticum 



4. Vestibular Root 



5. Internal Dorsal Nucleus 



6. External Dorsal Nucleus, or Nucleus of 



Deiters 



7. Nucleus of Bechterew 



8. Inferior or Descending Root of Auditory 



Nerve 



9. Ascending Cerebellar Fibres 



10. Fibres passing to Raph^ 



11. Oblique Fibres 



12. Fillet 



13. Inferior Sensory Root of Fifth Cranial Nenre 



14. Pyramidal Fibres 



15. Raph^ 



16. Fourth Ventricle 



17. Inferior Peduncle of Cerebellum (Restiform 



Body) 



18. Origin of Striae Acusticas 



lateral or dorsal nucleus, or tuberculum acusticum, is situated on the 

 lateral and dorsal aspects of the restiform body. The fibres of the 

 cochlear nerve or root enter these two nuclei, and terminate in 

 arborizations around their component cells. 



Central Connections of the Ventral and Lateral Cochlear Nuclei. — 

 The ventral and lateral nuclei constitute cell-stations in the path 

 of the fibres of the cochlear nerve, and from these cell-stations two 

 fresh nerve-tracts arise, one being ventral, which constitutes the 

 corpus trapezoides, and the other dorsal, which forms the striae 

 acusticae. 



