196 TEXT-BOOK OF PHYSIOLOGY. 



When obtained from a dog under these circumstances the intes- 

 tinal juice is watery in consistence, slightly opalescent, light yellow in 

 color, alkaline in reaction, with a specific gravity of i.oio. Chemic 

 analysis reveals the presence of proteids, mucin, and sodium car- 

 bonate. 



The intestinal juice obtained by Tubbey and Manning from a 

 small portion of the human intestine (ileum) was opalescent, occa- 

 sionally brownish in color, alkaline, and had a specific gravity of 1.006. 

 On the addition of hydrochloric acid, carbonic acid was given off, 

 showing the presence of carbonates. It contained proteids and 

 mucins. 



PANCREAS. 



The pancreas is a long flattened gland, situated deep in the 

 abdominal cavity, lying just behind the stomach. It measures from 

 six to eight inches in length, two and a half in breadth, and one in 

 thickness. It is usually divided into a head, body, and tail. The 

 head is directed to the right side and is embraced by the curved 

 portion of the duodenum; the tail is directed to the left side and 

 extends as far as the spleen (Fig. 81). The pancreas communicates 



Pancreatic ducts. Common bile-duct. 



FIG 81. -PANCREAS AND DUODENUM REMOVED FROM THE BODY AND SEEN FROM 

 BEHIND. THE GLAND is CUT TO SHOW THE DUCTS. (Landois and Stirling.} 



with the intestine by means of a duct. This duct commences at the 

 tail and runs transversely through the body of the gland. As it 

 approaches the head of the gland it gradually increases in size until 

 it measures about one-tenth of an inch in diameter. It then curves 

 downward and forwarcTand open^kitathe duodenum. In its course 

 3Ugh the gland it receives branches wnTcTfenteTlt nearly at right 

 The pancreas is richly supplied with blood-vessels and 

 QOes,jheJatterooD^ the solar lexus 



pancreas resembles 

 the salivary glands. It consists of a connective-tissue framework 



