CHAP. XV.] 



ALIMENTATION. 



177 



Mouth, containing tongue and teeth. 



Pharynx. 



(Esophagus. 



Stomach. 



( Duodenum. 

 Small intestine^ Jejunum. 



vlleum. 



( Caecum. 

 Large intestine^ Colon. 



I Rectum. 



Mouth or buccal cavity {vide Fig. 113). The mouth is a nearly 

 oval-shaped cavity with a fixed roof and movable floor. It is 

 bounded in front by the lips, on the sides by the cheeks, below 

 by the tongue, and above by the palate. The palate con- 

 sists of a hard portion 

 in front formed by 

 bone covered by mu- 

 cous membrane, and 

 of a soft portion be- 

 hind containing no 

 bone. The hard palate 

 forms the partition 

 between the mouth 

 and nose ; the soft 

 palate arches back- 

 wards and hangs like 

 a curtain between the 

 mouth and the phar- 

 ynx. Hanging from 

 the middle of its lower 

 border is a pointed 

 portion of the soft pal- 

 ate called the uvula ; 



and arching outwards and. downwards from the base of the 

 uvula on each side to the back of the tongue are two curved 

 folds of muscular tissue covered by mucous membrane, called 

 the pillars of the fauces. Just before reaching the tongue, 

 the two pillars, on either side, are separated by a triangular 

 space in which lie the small masses of lymphoid tissue called 

 the tonsils. The fauces is the name given to the aper- 



FIG. 112. THE SALIVARY GLANDS. 



