244 



PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. 



from the brain in the anterior medullary velum (valve of Vieussens) 

 just posterior to the inferior colliculus. It curves around the 



Fig. 108. — Diagram shcwang the average area of distribution of the sensory fibers of the 

 trigeminal nerve. — {Gushing.) 



N. opht. 



Principal 



motor 



nucleus. 



Descending 

 j spinal root. 



N. max. eup. 



N. max. inf. 



Fig. 109. — Nuclei of origin of the fifth cranial nerve. — (From Poirier and Charpy, after 

 Van Gehuchten.) 



pedunculus cerebri to reach the base of the brain. It is a motor 

 nerve, and supplies fibers to the superior oblique muscle of the 

 eyeball. In the interior of the brain the fibers arise from a 



