ANATOMY AND PHYSIOLOGY OF THE BRAIN 373 



The first two confer sensation, the third, motion 

 and sensation. 



The ophthalmic nerve, or first division of the fifth 

 nerve, is sensor and the smallest branch of the ganglion. 

 It is flattened, about 1 inch long. It receives filaments 

 from the cavernous plexus, and gives off filaments to 

 the third and sixth, and sometimes to the fourth nerve, 



FIG. 133 



Internal carotid artery 

 and carotid plexus. 



Ophthalmic . . 



(ciliary) gangli -n. S- : 



?il ^ 



SI 



Nerves of the orbit and ophthalmic ganglion. Side view. (Gray ) 



and a recurrent branch running in the tentorium cere- 

 belli with the fourth. Finally, it divides into the 

 frontal, lacrymal, and nasal nerves, which pass through 

 the sphenoidal fissure into the orbit. 



The second division of the fifth nerve (superior 

 maxillary) is sensor, and enters the foramen rotund urn, 



