THK RABBIT. 



61 



are examples of a very simple type of gland ; a tube, not 

 branched, but coiled up into a little bunch at the end. 



The rabbit's pancreas is a good example of a diffuse 

 gland, the various acini or dilated endings being scattered 

 irregularly through the mesentery that joins the two limbs 

 of the duodenum. The salivary-glands, on the other hand, 

 are compact, that is apparently solid masses, though really 

 consisting of just the same parts as the pancreas. 



18. The Liver is the most compact gland in the body. 

 It consists (fig. 22) of five lobes, from each of which a duct 

 comes to join the others 

 and form the bile-duct. 

 There is also a blind 

 outgrowth, the gall- 

 bladder, which serves 

 as a reservoir for the 

 bile and has its own 

 duct, the cystic duct, 

 joining the others. At 

 ordinary times, bile 

 secreted in the lobes of 

 the liver passes down 

 the minor ducts and 

 then up into the gall- 

 bladder j but when food 

 enters the duodenum 

 the stored bile quickly 

 flows out. 



If we cut across any 

 one of the lobes of the 

 liver and examine its 



cut surface, we easily see that it is made up of a vast 

 number of small polyhedral masses, closely compacted 

 together, about $ of an inch in diameter. These are 

 the lobules, and they constitute the essential part of the 

 liver, though of course, here and there between them 

 we see branches of the bile-duct, of the portal vein, and 

 of the hepatic artery and factors of the hepatic vein. 



If we examine a thin section of any part of the liver 



'act 

 "~Cosnmort 6ift cfuct 



ucfafe cfuct 



Fig. 22. LIVEK OF RABBIT. 



