CHAPTER IV. 

 DIGESTIVE SYSTEM. 



The digestive system consists of alimentary canal 

 and accessory digestive glands. 



The Alimentary Canal. This is a muscular tube 

 extending through the body and measures about 

 thirty feet in length. The following parts will be 

 described : 



I. Mouth 

 II. Pharynx. 



III. Esophagus. 



IV. Stomach. 



V. Small Intestine. 



1. Duodenum. 



2. Jejunum. 



3. Ileum. 



IV. Large Intestine. 



1. Vermiform Appendix. 



2. Cecum. 



3. Colon. 



(a) Ascending. 

 (6) Transverse. 



(c) Descending. 



(d) Sigmoid Flexure. 



4. Rectum. 



THE MOUTH. 



The mouth is limited by the lips in front, and the 

 cheeks laterally. The arched palate forms its roof 

 136 



