THE BRAIN 



501 



Fio. 160. — The Base or Under-Surface of the Braik. 



A, frontal lobe ; B, temporal lobe of the cerebral hemispheres ; Cb. 

 cerebellum : /, the olfactory nerve ; //, the optic nerve ; ///. />', VI. the 

 nerves of the muscles of "the eye ; (', the trigeminal nerve : VII, the 

 facial nerve ; VIII. the auditory nerve ; IX, the glossopharyngeal ; 

 A', the pneumogastric ; A7, the spinal accessory ; A7/, the hypoglossal, 

 or motor nerve of the tongue. The number VI is placed upon the pons 

 Varolii. The medulla oblongata (i1/) is seen to be really a continu- 

 ation of the siiinal cord ; on the lower end are seen the two cres- 

 cents of grey matter ; the section, in fact, has been carried thro\igh 

 the spinal cord, a little below the proper medulla oblongata. From 

 the siiles of tlie medulla oblongata are seen coming off the X, XI, 

 and XII nerves ; and just where the medulla is covered, so to speak, 

 by the transversely dispose i pons Varolii, are seen coming off the 

 /■// nerve, and more towards the middle line the VI. Out of the 

 substance of the pons springs the V nerve. In fmnt of that is sen 

 the wcU-dcfiued anterior border of the ^)ons ; and coming forward 



