ANATOMY AND PHYSIOLOGY OF' THE BRAIN 375 



filiform and fungiform papillae in the mucous mem- 

 brane on the back of the tongue. 



THE SIXTH NERVE. The sixth or abducens has 

 an apparent origin in the groove between the pons 

 and medulla. It runs to the lower and outer part 

 of the dorsum sellse, and traverses the floor of the 

 cavernous sinus external to the carotid artery, and, 

 receiving branches from the cavernous and carotid 

 plexuses, enters the orbit by the sphenoidal fissure 



dirision oj oculo-motoi\ 

 Nasal. 



Inferior division of oculo-motor. 

 'Abducent. 

 'Ophthalmic rein. 



Relations of structures passing through the sphenoidal fissure. (Gray.) 



between the two heads of the external rectus; it 

 receives a branch from the ophthalmic nerve, and 

 supplies the above-named muscles. 



THE SEVENTH NERVE. The seventh or facial 

 has a superficial origin from the depression between 

 the olivary and restiform bodies of the medulla oblon- 

 gata. Between it and the eighth is the pars inter- 

 media, which joins the facial in the auditory canal. 

 The nerve runs outward to the internal meatus, 

 where it runs in a groove on the auditory nerve, 

 enters the aqueductus Fallopii, and emerges at the 



