CRANIAL NERVE NUCLEI. 



Third ventricle 

 Nucleus of third nerve. 



Descending root of 



fifth nerve. 



Nucleus of fourth nerve. 



Upper sensory nucleus . 



of fifth nerve. 



Motor nucleus of 



fifth nerve. 



Middle sensory of 

 nucleus of fifth nerve. 



Nucleus of sixth 

 nerve. 



External dorsal 

 nucleus of eighth 

 nerve (Deiter's 

 nucleus). 



Internal dorsal nucleus 



of eighth nerve. 



Nucleus of seventh 



nerve. 



Sensory nucleus of 



ninth nerve. 



Fasciculus solitarius. 



Lower sensory nucleus 



and ascending root of 



fifth nerve. 



Sensory nucleus of 



tenth nerve. 



Nucleus ambiguus. 



Nucleus of twelfth nerve. 



Upper quadrigeminal 

 body. 



Lower quadrigeminal 



body. 



Lateral fillet. 



Superior peduncle of 

 cerebellum. 



Eminentia teres. 

 Superior fovea. 



Middle peduncle 

 of cerebellum. 



Eminentia acustica. 



Inferior peduncle 

 of cerebellum. 

 Auditory striae. 



Trigonum 

 acusticum. 



Inferior fovea. 

 Trigonum 

 hypoglossi. 

 Trigonum vagi. 



Tubercle of Rolando. 



Funiculus cuneatus. 



FIG. 17. Diagram of the floor and lateral boundaries of the fourth ventricle, showing 

 the positions of the nuclei of the cranial nerves on the left side. (From Morris's 

 Anatomy, after Arthur Robinson.) 



[To face page 191. 



