6i8 



THE NERVOUS SYSTEM 



established, but apparently fibers pass to the nucleus fastigii of the opposite 

 side and to the vermis, where they are brought into relations with motor 

 descending paths. 



Functions. The cochlear branch is the auditory nerve proper, and the 

 vestibular is the nerve of equilibrium. The reader is referred to the chapter 

 on Hearing for the details of function. 



CORPORA QUADRIGEMINA 



FIG. 414. The Nuclei of Origin and Central Connections of the Auditory and Vestibula 



Nerve. (Cunningham.) 



The Ninth Nerve, or Glosso-pharyngeal. Origin. The glosso-phar- 

 yngeal nerves, figure 378, IX, arise by nuclei intimately associated with 

 those of the vagus and spinal accessory nerves. The union of the nuclei is 

 indeed so intimate that it will be as well to consider the origins of the ninth, 

 tenth, and eleventh nerves together. 



These three nerves emerge from the bulb and spinal cord in their numerical 

 order from above downward, the bulbar portion from the lateral aspect of 

 the bulb in a line between the olivary and restiform bodies; and the spinal 



