RELATIONS OP THE MOUTH WITH THE HEAD. 439 



extends its influence throughout the whole and every part 

 of the body. 



The last mentioned function of the mouth, speech, is more 

 closely related with the brain, though it has the same or- 

 gans for its performance, as those employed in the above 

 functions of the first stages of digestion. For this function 

 is impaired when the teeth are lost, the palate cleft, the 

 tonsils swollen, or the lip cleft, and it is partially or entirely 

 lost in congestion and apoplexy of the brain. 



