104 



DIGESTION 



has been previously kept by a muscular curtain, the soft 

 palate. The pharynx opens into both the mouth and 

 the nose and is the part of the throat which we see when 

 we look into an open mouth. At the bottom of the 



Epiglottis 



Grcumvallate 

 papillae 

 Fungiform 



papillae 



FIG. 68. The upper surface of tongue and the throat. 



pharynx there are two openings. One of these, the wind- 

 pipe or trachea, has a swinging lid which closes during 

 swallowing so as to keep the food out. The other, the 

 gullet or esophagus, is the regular passage for the food 

 and is open only during swallowing. 



