182 



HUMAN PHYSIOLOGY 



When we take up the minute organization of these parts 

 we shall see that the usage is reasonable. Glands which 

 are placed distinctly away from the canal have ducts 

 leading to it for the discharge of their secretions. 



Three pairs of salivary glands contribute saliva to 

 the mouth. On either side there is a parotid gland below 

 and before the ear. Its duct runs forward to empty 

 on the inside of the cheek opposite the upper molar 

 teeth. The submaxillary gland is near the angle of the 

 jaw; it has a duct opening under the tongue close to its 

 fellow from the other side. At or near the same point 

 comes in the secretion of the small sublingual gland which 

 is under the floor of the mouth. 



FIG. 45. A diagrammatic sketch of the stomach from behind. This 

 unusual point of view serves to show how the bile-duct, originating from 

 branches in the liver (6) and connected with the gall-bladder (g), unites 

 with the main duct of the pancreas as the two enter the duodenum (d) ; 

 (p) is the pancreas with the course of the duct along the axis of the organ 

 dotted. 



Glands of a microscopic order discharge by openings 

 that may be spoken of as pores over the entire lining of 

 the stomach and intestine. They secrete the gastric 

 juice into the stomach and the intestinal juice or succus 



