242 SPECIAL SENSES. 



the facial, which is not constant. Branches from the glosso- 

 pharyngeal go to the otic ganglion and to the carotid plexus 

 of the sympathetic. 



The distribution of the glosso-pharyngeal is quite exten- 

 sive. The tympanic branch, the nerve of Jacobson, arises 

 from the anterior and external part of the ganglion of An- 

 dersch, and enters the cavity of the tympanum, where it di- 

 vides into six branches. Of these six branches, two poste- 

 rior are distributed to the mucous membrane of the f enestra 

 rotunda and the membrane surrounding the f enestra ovalis ; 

 two anterior are distributed, one to the carotid canal, where it 

 anastomoses with a branch from the superior cervical ganglion, 

 and the other to the mucous membrane of the Eustachian 

 tube ; two superior branches are distributed to the otic gan- 

 glion and, as is stated by some anatomists, to the spheno- 

 palatine ganglion. 1 



A little below the posterior foramen lacerum, the glosso- 

 pharyngeal sends branches to the posterior belly of the di- 

 gastric and to the stylo-hyoid muscle. There is also a branch 

 which joins a filament from the facial to the stylo-glossus. 



Opposite the middle constrictor of the pharynx, three or 

 four branches join branches from the pneumogastric and the 

 sympathetic to form together the pharyngeal plexus. This 

 plexus contains numerous ganglionic points, and filaments of 

 distribution from the three nerves go to the mucous mem- 

 brane and the constrictors of the pharynx. Probably, the 

 mucous membrane is supplied by the glosso-pharyngeal. As 

 we have stated in another volume, it is probable that the 

 muscles of the pharynx are supplied by filaments from the 

 pneumogastric, which are originally -derived from the spinal 

 accessory. 3 



Near the base of the tongue, branches are sent to the 

 mucous membrane covering the tonsils and the soft palate. 



The lingual branches penetrate the tongue about midway 



1 SAPPEY, Traite cPanatomie, Paris, 1871, tome Hi., p. 339. 

 8 See vol. iv., Nervous System, p. 207 



