STRUCTURE OF THE PANCREAS. 185 



alcohol and treated in the manner described in section 2. The cells 

 also contain pigment-granules, many of which are stained by potassic 

 ferrocyanide and hydric chloride (presence of iron). 



The bile-ducts commence between the hepatic cells in the form of fine 

 canaliculi, which lie between the adjacent sides of two cells, and form a 

 close network, the meshes of which correspond in size to the cells (fig. 

 216). At the periphery of the lobule these fine canaliculi pass into the 

 interlobular bile-ducts (fig. 217). 



The bile-ducts are lined by clear columnar epithelium (fig. 214, d). 

 Outside this is a basement-membrane, and in the larger ducts some 

 fibrous and plain muscular tissue. Many of the larger ducts are beset 

 with small csecal diverticula. 



The gall-bladder is in its general structure similar to the larger bile- 

 ducts. It is lined by columnar epithelium, and its wall is formed of 

 fibrous and muscular tissue. 



The lymphatics of the liver are said to commence as perivascular 

 lymphatic spaces inclosing the capillaries of the lobules. Efferent 

 lymphatics pass away from the organ in the connective tissue which in- 

 vests the portal and hepatic veins. 



THE PANCREAS. 



The pancreas is a tubulo-racemose gland, resembling the salivary 

 glands, so far as its general structure is concerned, but differing from 

 them in the fact that the alveoli, in place of being saccular, are longer 



FIG. 218. SECTION OF THE PANCREAS OF THE DOG. (Klein.) 

 d, termination of a duct in the tubular alveoli, alv. 



and more tubular in character (fig. 218). Moreover, the connective 

 tissue of the gland is somewhat looser, and there occur in it at intervals 

 small groups of epithelium -like cells, which are supplied with a close 



