1072 



THE ORGANS OF DIGESTION, 



Inferiorly : 



Duodeno-jejunal flexure; 



Third and fourth parts of duodenum ; 



Jejunum ; 



Transverse colon ; 



Lower layer of transverse mesocolon ; 



Superior mesenteric vessels ; 



Inferior mesenteric vein ; 



Mesentery. 



Vessels and Nerves. The pancreas is the only abdominal organ which does not 

 have a special artery from the aorta. Its supply comes from the coeliac axis and 

 superior mesenteric. The splenic artery gives the pancreaticoe parvce and pan- 

 creatica magna, which supply the tail and body. The pancreatico-duodenalis 

 superior comes from the gastro-duodenalis of the hepatic. These all come from 

 the coeliac axis. The superior mesenteric gives off the pancreatico-duodenalis 

 inferior, which, with the superior, supplies the head. 



The veins are of the same names, and empty into the splenic and superior 

 mesenteric veins, all belonging to the portal system. 



The lymphatic vessels are numerous, divided, according to their course, in 

 upper, lower, right, and left sets (Sappey). 



The upper open into a row of lymph-glands along the splenic artery ; the 

 lower open into glands on the posterior surface around the superior mesenteric 

 vessels ; the right open into three or four glands found between the head of the 

 pancreas and descending duodenum ; the left, into a group of glands situated 

 between the tail of the pancreas and spleen in the pancreatico-lienal ligament. 



The nerves rise from the coeliac plexus, and probably have some elements of 

 the right vagus, and accompany the vessels which supply the pancreas ; the most 

 of them go with the splenic artery. They are non-medullated and gangliated. 

 In the gland they run independently of the vessels. 



In structure the pancreas closely resembles the parotid gland. It differs in 

 certain particulars, and is looser and softer in its texture It is not enclosed in a 



Larger duct 



- Commencement of duct 



Inner zone of alveolar 

 cells 



FIG. 686. Section of alveoli and duct. Human pancreas. (Bohm and Davidoff.) 



distinct capsule, but is surrounded by areolar tissue which dips down into its 

 interstices and divides the gland tissue into lobes, and these are subdivided by 

 septa into lobules which in turn are composed of groups of alveoli, connected 



