HANDBOOK OF PHYSIOLOGY. 



DIGESTION IN THE INTESTINES. 



After the food has been duly acted upon by the gastric juice, such of 

 it as has not been absorbed passes into the duodenum, and is there 

 subjected to the action of the secretions of the pancreas and liver which 

 enter that portion of the small intestine, as well as to the secretion 

 (succus entericus) which is poured out into the intestines from the glands 

 lining them. Mixed with products of gastric digestion is found a 

 certain amount of proteid matter which has not been acted upon 

 at all: the fats are also included and such carbohydrates as have not 

 been acted upon by salivary digestion together with products of this 

 digestion. 



'I 16 , Pancreas of a dog during digestion, a, alveoli lined with cells, the 



duct liued with 



THE PANCREAS, AND ITS SECRETION. 



The Pancreas is situated within the curve formed by the duo- 

 denum; and its main duct opens into that part of the small intestine, 

 through a small opening, or through a duct common to it and to the 

 liver, about two and a hall inches from the pylorus. 



Structure. In structure the pancreas bears some resemblance to the 

 salivary glands. Its capsule and septa, as well as the blood-vessels and 

 lymphatics, are similarly distributed. It is, however, looser and softer, 

 the lobes and lobules being less compactly arranged. The main duct 

 divides into branches (lobar ducts), one for each lobe, and these branches 

 subdivide into intra-lobular ducts, and these again by their division 

 and branching form the gland tissue proper. The intralobar ducts 

 correspond to a lobule, while between them and the secreting tubes or 



