THE FIFTH NERVE 



339 



root above the larger, some transverse fibers of the pons separat- 

 ing the two. This nerve confers both motion and sensation. 

 At the apex of the petrous portion of the temporal the large 

 root forms the Gasserian ganglion; the smaller does not join in 

 the ganglion, but runs below it to join, just below the foramen 

 ovale, the lowest trunk proceeding from the ganglion. 



FIG. 59 



Internal carotid 

 and carotid plexus 



rtery 



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



The Gasserian ganglion lies in a hollow near the apex of the 

 petrous portion of the temporal, the large superficial petrosal 

 nerve, and the motor root lying below it. It receives branches 

 from the carotid plexus. Small twigs pass to the dura mater. 

 This ganglion sends off three large branches, viz., the ophthal- 

 mic, superior maxillary, and inferior maxillary. 



The first two confer sensation, the third, motion and sensa- 

 tion. 



The ophthalmic nerve, or first division of the fifth nerve, 

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

 flattened, about one inch long, and runs in the outer wall of the 



