92 



PSYCHOBIOLOGY 



Some of the fibers of the vestibular division of the eighth nerve continue 

 through the medulla into the cerebellum. Other fibers connect with four 

 nuclei: The principal, medial, or dorsal; the descending ("nucl. of the 

 descending root") ; the superior ("nucl. of Bechtereff ") and the lateral 

 ("nucl. of Deiters") nuclei of the vestibular nerve. From these nuclei 

 connections are made with the cerebellum, the nuclei of other cranial 



CORPORA QUAORICEMINA 



Fig. 74. Diagram of the central connections of the cochlear division of the eighth 

 (auditory) nerve. (Quain's Anatomy.) 



nerves and descending paths in the cord. Connections with the cerebral 

 hemispheres are conjectural. 



IX. The glossopharyngeal nerve (mixed), X. the vagus (or pneu- 

 mogastric) nerve (mixed), and XL the accessory nerve (efferent only), 

 are so closely associated that they must be considered together. The 

 accessory nerve has two divisions; the bulbar and the spinal accessory. 



