1104 



THE DIGESTIVE SYSTEM 



The digestive system, then, may be considered to present the following parts 

 I. The alimentary canal, or digestive tube. 

 II. Special organs, found in the wall of this canal. 

 III. Accessory glands, placed external to the wall of the tuba 



Cavum nasi 

 Palatum durum 1 



Pars nasalis pharyngis 



Cavum oris proprium 



Pars oralis pharyngis 



~- (Esophagus 



I 



undus of 

 ;omach 



Flexura coli 

 sinistra 



_ * Pancreas 



Position of 

 - umbilicus 

 Colon 

 descendens 



Rectum 



FIG. 873. DIAGRAM OF THE GENERAL ARRANGEMENT OF THE DIGESTIVE SYSTEM. 



The processus vermiformis is seen hanging down from the caecum. The transverse colon is not represented, 

 in order that the duodenum and pancreas, which lie behind it, may be seen. 



The greater part of the digestive system is found in the abdomen, and hence, in 

 this section, the abdominal cavity, together with its lining membrane the peritoneum 

 falls to be described. 



I. Alimentary Canal. The alimentary canal, taken as a whole, measures, wher 

 fully extended, about 30 feet (9 metres) in length, and consists (Fig. 873) of the 



