UIGEKTUE SYSTEM 



73 



double spiral coils. There are two incomplete longitudinal bands 

 in the colon. The mucous membrane contains many solitary follicles, 

 and l'e.\er's i)atclies may extend into the first portiou of tlie colon. 

 The rectum is twelve to fifteen inches in length and is usually sur- 

 r-ounded with fat. 



Liver 



The liver of swine is I'elatively laige, weighing about four pounds 

 in a mature animal. Tt is centrally located although the major 

 portion is to the right of the median line. It is of a brownish red 

 color and the lobules are usually distinctly <nitlined. The central 

 portion is thick, the margins thin, and it is divided into four prin- 



Fig. 'M. Piece of swine liver showing lobules. (Ostertagl. 



eipal lobes by three fissures. The gall-bladder is located in a 

 depression on the posterior surface of the right central lol)e. The 

 posterior vena cava passes through the substance of the liver and 

 enters the thorax through a notch. The liver is maintained in its 

 ))osition by the other ^'iscera and two (Mironar}' ligaments, altlnugh 

 I'udiments of other ligaments are sometimes present. 



Pancreas 



The j)ancreas is irregularl.v triangular in shape and is attached 

 to the duodenum. The pancreatic duct passes through the duodenal 

 wall opening about five inches fi'om the pylorus. 



