554 THE NERVOUS SYSTEM. 



tube ; also, to the carotid plexus, and, through the petrosal 

 nerve, to the spheno-palatine ganglion. After communi- 

 cating, either within or without the cranium, with the 

 pneumogastric, and soon after it leaves the cranium, with 

 the sympathetic, digastric branch of the facial, and the 

 accessory nerve, the glosso-pharyngeal nerve parts into the 

 two principal divisions indicated by its name, and supplies 

 the mucous membrane of the posterior and lateral walls of 

 the upper -part of the pharynx, the Eustachian tube, the 

 arches of the palate, the tonsils and their mucous mem- 

 brane, and the tongue as far forwards as the foramen 

 ceecum in the middle line, and to near the tip at the sides 

 and inferior part. 



Some experiments make it probable that the glosso- 

 pharyngeal nerve contains, even at its origin, some motor 

 fibres, together with those of common sensation and the 

 sense of taste. Whatever motor influence, however, is 

 conveyed directly through the branches of the glosso- 

 pharyngeal, may be ascribed to the filaments of the pneu- 

 mogastric or accessory that are mingled with it. 



The experiments of Dr. John Reid, confirming those of 

 Panizza and Longet, tend to the same conclusions ; and 

 their results probably express nearly all the truth regard- 

 ing the part of the glosso-pharyngeal nerve which is 

 distributed to the pharynx. These results were that, 

 I. Pain was produced when the nerve, particularly its 

 pharyngeal branch, was irritated. 2. Irritation of the 

 nerve before the origin of its pharyngeal, or of any of 

 these branches, gave rise to extensive muscular motions of 

 the throat and lower part of the face : but when the nerve 

 was divided, these motions were excited by irritating the 

 upper or cranial portion, while irritation of the lower end, 

 or that in connection with the muscles, was followed by 

 no movement ; so that these motions must have depended 

 on a reflex influence transmitted to the muscles through 

 other nerves by the intervention of the nervous centres. 



