Chap. 28.] Nerves of tie Ear, &c. 285 



it is partly alfo dhtributed on the mufcles of the lower 

 jaw. 



The fmh pair of nerves is final!, and is chiefly 

 diftribnted on the abductor mufcle of the eye j it 

 arifes from the fore part of the corpora, py.ramidalia, 

 and in its progrefs towards the foramen v.cerum 

 pailes through the receptacula at the fides of the 

 fella tufcica, where if is immeried in blood, but for 

 what purpofe is unknown. In the paflage of this 

 nerve below the dura mater, it lies very contiguous to 

 the carotid artery, and at this part a twig from it 

 defcends with the artery to form the beginning of the 

 intercoftal nerve. 



The feventh pair comes out from the lateral part 

 of the tranfverle, protuberance, and appears to be 

 double, each being accompanied with a larger artery 

 than moil other nerves ; it then enters the internal 

 meatus auditorius, where it feparates into two diftinct 

 portions j one of thefe goes to the internal parts of 

 the ear, and is there expended in producing a pulpy 

 membrane refembling the retina ; this clivifion of the 

 nerve is called the portio mollis j the other, the portio 

 dura, communicates with the fifth pair, and piercing 

 through the parotid gland is divided into numerous 

 ramifications, which are fpent on the upper part of the 

 neck and fide of the head. 



The eighth pair of nerves, which from the length 

 of its courfe and die variety of parts to which it is 

 diftributed is called par vagum, arifes from the lateral 

 bafis of the corpora olivaria in feparate fibres. The 

 eighth pair is foon joined by the nervus accefforius, 

 which is derived from the tenth pair of nerves, and 

 from feveral of thofe of the neck ; thus united, they 

 pafs out of the cranium through the fame opening 

 with the internal jugular veinj when they get out of 



the 



