284 Nerves of the Teeth. [Book IX: 



duc"r.or, deprimensj and obliquus minor mufcles of the 

 eye -ball. 



The fourth pair of nerves called pathetici, are the 

 fmalleft of all ; they arife from near the tubercula qua- 

 drigemina; they pafs out at the foramina lacera, and 

 are entirely fpent on the mufculi trochleares or fupe- 

 rior oblique mufcles of the eye-balls. 



The fifth pair is the largeft of thofe which proceed 

 from the head; they rife from the crura cerebelli, 

 where they join with thofe of the cerebrum, to form 

 the tranfverfe protuberance or pons Varolii. In their 

 progrefs they appear thicker at the fides of the fella 

 turcica, where each forms a diftincl: ganglion, from 

 which proceed three branches, which pafs out of the 

 cranium. 



The firft branch of the fifth pair is the opthalmic ; 

 it paffes out of the foramen lacerum, and is in its 

 paffage connected with the fixth pair; it afterwards 

 communicates with the firft and third pairs, and is 

 chiefly fpent on the orbit and the appendages of- the 

 eye. One branch pafles through the foramen fu- 

 perciliare of the os frontis, to be diftributed on the 

 forehead. 



The fecond branch of the fifth pair is chiefly fpent 

 on the parts of the upper jaw, and is therefore called 

 maxillaris fuperior j it is diftributed on the upper jaw 

 bone and its teeth, on the fore part of the palate, the 

 cheeks, upper lips, and noftrils. This branch com- 

 municates with the fixth pair of nerves, and with the 

 portio dura of the feventh pair. 



The third and moft confiderable branch of the fifth 

 pair is the rnaxillaris inferior ; part of this is loft in 

 the tongue ; another part goes to the teeth of the 

 lower jaw, to each of which it fends a feparate twig; 



it 



