374 DISSECTION OP THE EABBIT.- 



softer and dotted over with small white taste 

 papillse, which are especially numerous at and 

 under the tip. 



At the sides of the tongue, opposite the last 

 molar teeth, are a pair of oval patches, the 

 papillse foliatse, the surfaces of which are crossed 

 obliquely by close-set parallel ridges, in which 

 are imbedded numerous taste-bulbs. 



About a quarter of an inch above and behind 

 the papillae foliatfe are a pair of circumvallate 

 papillae, which are small and white, and sur- 

 rounded by circular grooves. 



b. The lower teeth, already described with the skeleton 

 (p. 312), are placed opposite the corresponding 

 teeth of the upper jaw, and bite against them. 



3. The sides of the mouth are smooth and soft, with the 



exception of a hairy patch on each side, between the 

 incisor and molar teeth. 



4. The pharynx is a continuation backwards of the buccal 



cavity, beyond the margin of the soft palate. The 

 mouth and the posterior narial chamber open 

 into it in front ; behind it is continued into the 

 CBSophagus ; and ventrally it communicates through 

 the glottis and trachea with the lungs. 



To expose the 'pharynx, extend the cut backwards about an 

 inch beyond the tongue. 



a. The glottis is a large opening in the floor of the 



pharynx, a short way behind the tongue, leading 

 into the trachea, or windpipe. 



b. The epiglottis is a thin bilobed cartilaginous flap, 



forming the anterior boundary of the glottis, and 

 projecting into the pharynx behind the tongue, 

 opposite the free edge of the soft palate.. During 

 the act of swallowing it is folded back over the 

 glottis, so as to close its entrance. 



