THE GLOSSO-PHARYNGEAL, NERVE. 527 



from the carotid plexus by the branch joining this nerve. These 

 enter the ganglion together, and are commonly spoken of as the 

 vidian nerve. Afferent (sensory) impulses, from the greater part 

 of the nasal cavity, pass through this ganglion. Its efferent 

 branches are (1) motor to the elevator of the soft palate and the 

 azygos uvulae ; (2) vaso-motor, which come from the sympathetic ; 

 and (3) secretory, which supply the glands of the cheek, etc. 



OTIC OR EAR GANGLION. 



The otic ganglion lies under the foramen ovale, where the in- 

 ferior division of the fifth comes out of the cranium. Its roots 

 are (1) motor ; and (2) sensory, from the inferior division of the 

 fifth ; and (3) sympathetic, made up of a couple of fine filaments 

 from the plexus, around the meningeal artery. By its branches 

 it communicates with the seventh, chorda tympani, and sends 

 filaments to the parotid gland. 



THE SUBM AXILLARY GANGLION. 



This is on the hyoglossus muscle in close relation to the lin- 

 gual branch of the fifth, from which it gets a sensory root. The 

 chorda tympani passes to the ganglion, carrying efferent impulses 

 through it to the gland. Its sympathetic branches come from 

 the plexus around the facial artery. 



VIII. THE GLOSSO-PHARYNGEAL NERVE. 



This nerve, forming part of the eighth pair, springs from the 

 floor of the fourth ventricle above the nucleus of the vagus. It 

 is a mixed nerve, the functions of which may thus be classified. 



Afferent fibres, which are of various kinds, viz.: 



(1.) Sensory fibres, carrying impulses from the anterior surface 

 of the epiglottis, the base of the tongue, the soft palate, the ton- 

 sils, the Eustachian tube and tympanum. 



(2.) Excito-motor. This nerve is a very important exciter of 

 reflex movements in swallowing and vomiting, when a stimulus 

 is applied to the glosso-palatine arch. 



