338 THE GLOSSO-PHARYNGEAL NERVE. 



cle ; 5, twig of the posterior auricular muscle ; 6, twig of the superior 

 auricular ; 7, anastomosis of the facial with the auricular of the cervical 

 plexus ; 8, branch for the stylo-hyoid and posterior belly of the digastric ; 

 9, temporo-facial anastomosis with the superficial auriculo-temporal of 

 the fifth pair ; 10, temporal ramifications of the facial ; 11, frontal twigs ; 

 12, superior palpebral twigs ; 13, middle palpebral twigs ; 14, inferior 

 or motor palpebral twigs; 15, suborbital twigs ; 16, suborbital plexus; 

 17, superior buccal; 18, cervico-facial branch; 19, buccal branches, anas- 

 tomosing 'with, 20, buccal nerve of fifth pair; 21, mental twigs, forming 

 with, 22, mental nerve of fifth pair, the mental plexus ; 23, cervical 

 branches ; 24, transverse cervical branch of cervical plexus ; 25, parotid 

 branches of the superficial auriculo-temporal ; 26, parotid branches of the 

 facial ; #, frontal muscle ; b, occipital muscle ; c, anterior auricular ; d, 

 superior auricular ; 0, posterior auricular; f, orbicularis palpebrarum; ^, 

 zygomaticus, major ; -A, buccinator ; ^orbicularis oris ; &, masseter; , 

 parotid gland ; m, platysma ; n, stylo-hyoid and posterior belly of di- 

 gastric ; o, sterno-cleido-mastoid ; j?, trapezius. 



OF THE NINTH PAIR, OR GLOSSO-PHARYNGEAL. 



This nerve arises by five or six filaments from the groove between 

 The ninth pair, ^ ie ^ var 7 an ^ restiform bodies. Its origin may be traced 

 or giosso-pha- to the vesicular substance in the floor of the fourth ventricle : 

 passing forward, it is distributed to the mucous membrane 

 of the base of the tongue and fauces. While in the jugular fossa it 

 forms two ganglia, a small one produced by its posterior fibres, and call- 

 ed the superior ganglion ; a second, much larger, termed the inferior, or 

 ganglion of Andersch. The branches given off by the glosso-pharyngeal 

 are the muscular, the tympanic or Jacobson's nerve, which is distributed 

 to the inner wall of the tympanum and interior portions of the ear ; the 

 pharyngeal, which supplies the pharynx, and, with branches of the pneu- 

 mogastric and sympathetic, forms the pharyngeal plexus ; the lingual 

 supplies the mucous membrane of the sides and base of the tongue ; 

 the tonsillitic, which supplies the mucous membrane of the fauces and 

 soft palate, and forms a plexus round the base of the tonsil. Besides 

 these, the glosso-pharyngeal anastomoses with the facial, pneumogastric, 

 accessory, and sympathetic. 



Examined in the usual way, the glosso-pharyngeal proves to be a cen- 

 tripetal nerve, having the power of producing reflex motions through the 

 nerves of deglutition, its motor influence being chiefly due to its con- 

 nections with the pneumogastric and accessory. Though thus a sen- 

 sory nerve, it is doubtful whether it be the only nerve of taste, or whether 

 that function is not likewise participated in by the lingual branch of the 

 fifth pair. It is certain that section of the lingual does not destroy the 



