THE STRUCTURE AND ACTIVITIES OF MAMMALS 403 



(upper portion in man) contains the heart and lungs. The 



posterior cavity is filled with the abdominal viscera (Fig. 273). 



Digestion. The digestive system is similar to that of other 



vertebrates in general structure, consisting of an alimentary 



nasal cavity 

 palate 

 tongue 



pylorus 



bile duct 



transverse colon 

 liver 



opening of bile 



and pancreatic ducts 



small intestine 



passage from nose to throat 

 cavity of mouth 

 throat cavity 

 opening of windpipe 



pancreatic dnct 



appendix' 



FIG. 274. Parts of the alimentary canal of man. (From Peabody and Hunt.) 



canal and the glands connected with it (Fig. 274). The alimen- 

 tary canal begins with the mouth cavity in which are the 

 tongue and teeth, then follow in succession the oesophagus, 

 stomach, small intestine, large intestine, and rectum. The 



