908 



NEUROLOGY 



I 



In passing through the jugular foramen, the nerve presents two ganglia, the 

 superior and the petrous (Fig. 791). 



The Superior Ganglion (ganglion superius; jugular ganglion} is situated in the; 

 upper part of the groove in which the nerve is lodged during its passage through 

 the jugular foramen. It is very small, and is usually regarded as a detached 

 portion of the petrous ganglion. 



The Petrous Ganglion (ganglion petrosum; inferior ganglion) is larger than the 

 superior and is situated in a depression in the lower border of the petrous portion 

 of the temporal bone. 



Trochlear nerve 



Trigeminal -nerve 

 Facial nerve 

 Acmistic nerve 



Cerebral peduncle 



Superior peduncle 

 Middle peduncle 



Inferior peduncle 



Glossopharyngeal, 

 nerve 



Vagus nerve 



Accessory nerve 

 (cranial part) 

 Bypoglossal nerve 



Accessory nerve 

 (spinal part) 



Post, roots of first 

 cervical nerve 



Medulla spinalis 



Dura mater 

 (laid o ye 1 1 



Vertebral artery 

 Clava 

 Fasciculus cuneatus 



fasciculus (jracilis 



Fio. 792. Upper part of medulla spinalis and hind- and mid-brains; posterior aspect, exposed in situ. 



Branches of Communication. The glossopharyngeal nerve communicates with 

 the vagus, sympathetic, and facial. 



The branches to the vagus are two filaments which arise from the petrous gan- 

 glion, one passing to the auricular branch, and the other to the jugular ganglion, 

 of the vagus. The petrous ganglion is connected by a filament with the superior 

 cervical ganglion of the sympathetic. The branch of communication with the facial 

 perforates the posterior belly of the Digastricus. It arises from the trunk of the 

 glossopharyngeal below the petrous ganglion, and joins the facial just after the exit 

 of that nerve from the stylomastoid foramen. 



Branches of Distribution. The branches of distribution of the glossopharyngeal 

 are: the tympanic, carotid, pharyngeal, muscular, tonsillar, and lingual. 



