CHAPTER XXVI. 

 TASTE, SMELL, HEARING, AND THE VOICE. 



Uses of the Sense of Taste. The sense of taste helps 

 us in judging of the fitness of food. By reflex action the 

 taste of agreeable substances aids in digestion by stimulat- 

 ing the glands, especially the salivary glands. 



The Papillas. The surface of the tongue is covered 

 with papillas. Most of them are slender, and like the 



Papillas 



Glosso-pharyngeal 

 Nerve (9th) 



Gustatory Branch of Fifth Nerve 

 Fig. 101. Nerves and Papillas of the Tongue. 



papillas of the skin, are organs of touch. Scattered among 

 these are larger papillas in which are the endings of the 



nerves of taste. 







The Nerve Supply of the Tongue. The nerves of taste 

 are the glosso-pharyngeal, distributed to the back part of 

 the tongue, and the gustatory in the front part. The tip 

 of the tongue seems to be most sensitive to sweets and 

 salts, the back part to bitters, and the sides to acids. 



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