644 STRUCTURE OF THE BULB, PONS, AND MID-BRAIN foil. XLIV. 



which arise from Deiters' nucleus pass into the posterior longitudinal 

 bundles of both sides (see p. 636) ; those which start in Bechterew's 

 nucleic become longitudinal, but their destination is uncertain. 



TO VERMIS 



TO HEMISPHERE 



FIBRES OF 



VESTIBULAR 



ROOT 



NERVE -V//^(GANGLION OF 

 ENDINGS *4/f SCARPA 

 IN MACUL/E 

 8.AMPULL/E 



FIG. 468. Vestibular root of the auditory nerve ; r, restiform body ; V, descending root of the fifth 

 nerve ; d, fibres of descending vestibular root ; n. d., cell of descending vestibular nucleus ; D, nucleus 

 of Deiters ; B, nucleus of Bechterew: n. t., nucleus tecti of cerebellum : p. I. b., posterior longitudinal 

 bundle. (Schafer.) 



The accompanying diagrams (ligs. 467 and 468) will serve to render 

 these complex relationships clearer. 



The ninth nerve (glosso-pharyngeal) gives filaments through its 

 tympanic branch (Jacobsen's nerve) to the fenestra ovalis and 

 fenestra rotunda, and the Eustachian tube, parts of the middle ear ; 

 also, to the carotid plexus, and through the great superficial petrosal 

 nerve, to the spheno-palatine (Meckel's) ganglion. The small 

 superficial petrosal (Jacobsen's nerve) passes to the otic ganglion, 

 and thus controls the parotid secretion. The carotid plexus may 

 also connect the nerve with the spheno-palatine ganglion. Connections 

 are also made with the sympathetic plexus on the great meningeal 

 artery by the external superficial petrosal. This is important, as 

 another possible connecting link between the glosso-pharyngeal and 

 the otic ganglion is thus provided. After communicating, either 

 within or without the cranium, with the vagus, it leaves the cranium, 

 divides into the two principal divisions indicated by its name, and 

 supplies the mucous membrane of the posterior and lateral walls of 

 the upper part of the pharynx, the Eustachian tube, the arches of 

 the palate, the tonsils and their mucous membrane, and the tongue 



