584 



THE SYMPATHETIC SYSTEM. 



Fig. 184. 



the eyeball, pierce the scelerotic, and terminate in the muscular tissue 

 of the iris. 



The next is the xpheno-palatine ganglion, situated in the spheno- 



maxillary fossa. It commu- 

 nicates, like the preceding, 

 with the carotid plexus, and 

 receives a motor root from 

 the facial nerve, and a sensi- 

 tive root from the superior 

 maxillary branch of the fifth 

 pair. Its filaments are dis- 

 tributed to the levator palati 

 and uvular muscles, to the 

 mucous membrane of the pos- 

 terior part of the nasal pas- 

 sages, and to that of the hard 

 and soft palate. 



The third sympathetic gan- 

 glion is the submaxillary ) 

 situated upon the submaxil- 

 lary gland. It communicates 

 with the superior cervical gan- 

 glion of the sympathetic by 

 filaments which accompany 

 the facial and external carotid 

 arteries. It derives its sensi- 

 tive filaments from the lingual 

 branch of the fifth pair, and 

 its motor filaments from the 

 facial nerve, by means of the 

 chorda tympani. Its branches 

 of distribution pass mainly to 

 the subm axillary gland and 

 Wharton's duct. 



The last sympathetic gan- 

 glion in the head is the otic 

 ganglion. It is situated be- 

 neath the base of the skull, 

 on the inner side of the third 

 division of the fifth pair. It 

 receives filaments of communication from the carotid plexus ; a motor 

 root from the facial by means of the small superficial petrosal nerve, 

 as well as one or two short fibres from the inferior maxillary division 

 of the fifth pair ; and a sensitive root from the glossopharyngeal by 

 the nerve of Jacobson. Its branches are sent to the internal muscle of 

 the malleus in the middle ear (tensor tympani), to the circurnflexus palati, 

 and to the mucous membrane of the tympanum and Eustachian tube. 



GANGLIA AND NERVES OP THE SYMPA- 

 THETIC SYSTEM. 



