CHAPTER VI 

 \ 



STOMACH DIGESTION 



84. Cavities of the body. A muscular partition, curved 

 sharply upward, divides the inside of the body into two 



cavities, an upper one, 



b 



called the chest or thorax, 

 which contains the heart, 

 lungs, and the esophagus, 

 and a lower one, called 

 the abdomen, which con- 

 tains the stomach, intes- 

 tine, liver, spleen, and 

 g kidneys. This muscular 



* partition is called the 

 . diaphragm. 



85. The abdomen and 



* peritoneum. The abdo- 

 men is a closed cavity, 

 bounded above by the 

 diaphragm, on the sides 

 partly by the ribs, and 

 behind partly by the 

 spinal column. The bones 

 of the pelvis form its floor. 

 The rest of its walls are 

 formed by thick sheets of 



muscles. It is lined with a very smooth membrane called 

 the peritoneum. 



66 



Organs of the chest and abdomen. 



a larynx. 



b trachea. 



c clavicle, or collar bone. 



d sternum, or breastbone. 



e lung. 



/ heart. 



g liver. 



h stomach. 



i large intestine. 



j small intestine. 



