456 Anatomy Applied to Medicine and Surge t y. 



maxillary, which supplies common sensation, and, along 

 with the chorda tympani, the special sense of taste 

 to the fore part and sides of the organ; the 

 glosso-pharyngeal, which is distributed to the base 

 and sides and furnishes this region with the sensa- 

 tion of taste; a few twigs of the superior laryngeal to the 

 root of the tongue near the epiglottis (function doubtful), 

 and, lastly, the hypo-glossal, supplying the muscles of the 

 tongue with motion. Herter considers that the fifth is the 

 special nerve of taste, and thai the path for taste reaches 

 'this nerve through the chorda tympani and the great 

 superficial petrosal, but, it would seem, rather, that the 

 path is up the chorda tympani to the pars intermedia, 

 which runs on the facial nerve and is derived from the 

 nucleus of the glosso-pharyngeal in the medulla. Uni- 

 formity in the nervous supply for the sensation of taste 

 would be marked if this were the case, since the chorda 

 tympani would supply the anterior two-thirds of the 

 tongue, and the glosso-pharyngeal, the posterior third, with 

 the special sense of taste, but, if the chorda tympani be 

 really a portion of the glosso-pharyngeal, then, it follows, 

 that the whole tongue would be supplied with taste by 

 means of the one nerve, viz., the glosso-pharyngeal. 



Reflexes. Ulcer of the tongue often causes pain in 

 the region of the distribution of the other branches of the 

 fifth nerve, viz., in the forehead (subra-orbital) ; the up- 

 per and lower teeth (dental) ; the side of the head, pinna 

 or external meatus (auriculo-temporal), or in the middle 

 ear (tympanic branch of the glosso-pharyngeal). The 

 lymphatics of the anterior part of the tongue converge to 

 the submaxi'llary glands, while those of the rest of the or- 

 gan go, principally, to the deep cervical glands. The 

 tongue is protruded by means of the genio-hyo-glossus 

 and is withdrawn by the hyo-glossus, stylo-glossus, and 



