228 



PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. 



portions of the ear, mouth, and tongue, and to the dura 

 mater (Fig. 101). In the interior of the brain the motor portion, 



Fig. 101. Diagram showing the average area of distribution of the sensory fibers of the 

 trigeminal nerve. (Cushing.) 



N. opht. 



Accessory 



motor 



nucleus. 



N. max. sup. 



N. max. inf. 



Fig. 102. Nuclei of origin of the fifth cranial nerve. (From Poirier and Charpy, after 



Van Gehuchten.) 



portio minor, arises partly from a small nucleus in the pons and partly 

 from a long column of cells extending along the lower margin of the 

 central gray matter throughout the midbrain. This column and 



