GLOSSO-PHARYNGEAL NERVE. 241 



tatory mucous membrane not supplied by filaments from the 

 chorda tympani. It is undoubtedly a nerve of taste ; and 

 the question of its other functions will be fully considered in 

 connection with its general properties, as well as the differ- 

 ences between this nerve and the chorda tympani. "We have 

 mentioned this nerve in another volume as the first division 

 of the eighth pair, according to the classification of Willis, 

 but have to treat of its physiological anatomy in this connec- 

 tion, as its most important function is in connection with 

 gustation. 



Physiological Anatomy. The apparent origin of the 

 glosso-pharyngeal is from the groove between the lateral 

 tracts of the medulla oblongata and the inferior peduncle of 

 the cerebellum, between the roots of the auditory nerve 

 above and the pneumogastric below. A number of its fila- 

 ments of origin come from the medulla and a portion from 

 the peduncle. The deep origin is nearly the same as that of 

 the pneumogastric, its filaments arising primarily from the 

 gray substance of the medulla oblongata. 1 From this origin, 

 the filaments pass forward and outward to the posterior fora- 

 men lacerum, which the nerve enters in company with the 

 pneumogastric, the spinal accessory, and the internal jugular 

 vein. At the upper portion of the foramen, is a small gan- 

 glion, the jugular ganglion, including only a portion of the 

 root. "Within the foramen, is the main ganglion, including 

 all of the filaments of the trunk, called the petrous ganglion, 

 or the ganglion of Andersch, after the anatomist by whom it 

 was first described. 8 



At or near the ganglion of Andersch, the nerve usually 

 receives a delicate filament from the pneumogastric. This 

 communication is sometimes wanting. The same may be 

 said of a small filament passing to the glosso-pharyngeal from 



1 See vol. iv., Nervous System, p. 204. 



2 ANDERSCH, Fragmentum Descriptions Nervorum Cardiacorum ; in 

 Scriptores Nevrologici minores selecti, Lipsise, 1792, tomus ii., p. 115. 



