THE NERVOUS SYSTEM 1493 



nucleus of Bechterew represents the upper and outer part of the 

 nucleus of Deiters. 



As the vestibular nerve passes backwards on the inner side of the 

 restiform body, some of its fibres, to be presently described, turn 

 downwards. The majority, however, pass to the dorsal or principal 

 nucleus, the nucleus of Deiters, and the nucleus of Bechterew, 

 and terminate in arborizations around the cells of these nuclei. A 

 few of the vestibular fibres are regarded as passing directly to the 

 cerebelliun (superior vermis). 



Central Connections of the Nuclei of the Vestibular Nerve. — ^The 

 fibres of the vestibular nerve terminate in the nuclei just stated. 



Median Line 



\- III. Nerve 



.-.IV. Nerve 



V. (Chief Motor Nucleus) 



VI. Nerve 



VII. (Facial) 



IX. and X. (Glosso-pharyn- 



eeal and Pneumogastric) 

 XII. (Hj-poglossal) 



'^^ XI. (Spinal Accessory) 



• ist Cervical Nerve 



Fig. 622. — Scheme showing the Continuation of the Grey Matter of 

 THE Spinal Cord into the Medulla Oblongata, Pons Varolii, and 

 Crura Cerebri (Poirier). 



(The separation into two columns on either side and the breaking up of 

 these into Cranial Motor Nuclei are indicated). 



The dorsal or principal nucleus and the nucleus of Deiters (including 

 the nucleus of Bechterew), are intimately related to the superior 

 vermis of the cerebellum, and especially to the rocf-nucleus, by 

 means of cerebellar fibres. This communication represents the 

 direct sensory cerebellar tract of Edinger, and it is contained within 

 the inferior peduncle of the cerebellum. The axons of many of the 

 cells of the nucleus of Deiters and nucleus of Bechterew pass into the 

 dorsal or posterior longitudinal bundle, within which they divide into 

 ascending and descending branches. In this manner the dorsal 



