100 



MUCOUS MEMBRANE. 



5. The Lining of the Alimentary Canal is a soft, red, 



moist kind of skin, named 

 a mucous membrane. You can 

 easily see part of it on ex- 

 amining the inside of your 

 mouth with the help of a 

 looking-glass. This mucous 

 membrane has two func- 

 tions, secretion and absorption. 

 Imbedded in it are thou- 

 sands of tiny glands (p. 65), 

 which, instead of making 

 perspiration or oily matter, 

 like the skin-glands, pour 

 out very different liquids, 

 which aid in swallowing and 

 digesting. 



6, The t Month-Chamber 

 (Fig. 24) opens in front be- 

 tween the lips, and behind 

 into the throat-chamber or 

 pharynx. It is bounded on 

 the sides by the cheeks, be- 

 p^hftej low b 7 the tongue, above by 



m, the sphenoid bone on the base of .-> , / , r^, 



the skull; , the fore part of the skull- tne/lWiWfc, 1 he front portion 



cavity; o,p, q, the turbinate bones of . . 



the outer side of the left nostril-cham- OI trie palate, /, Separates the 



mouth from 'the nose, and 



is supported by bone. This portion is named the hard 

 palate. The posterior portion of the palate, /, is soft 



5. What is the lining of the alimentary canal ? Where can you 

 easily see it ? What are its functions? How does it aid in swallow- 



ing and digesting ? 



6. Describe the mouth-chamber. 



The hard palate. The soft pal- 



