2i4 ELEMENTS OF HISTOLOGY. [Chap. xxvu. 



the larger interlobular bile ducts, lined with more or less 

 columnar epithelium. The first part of the bile duct 

 lined with polyhedral cells corresponds to the inter- 

 mediary part of the ducts of the salivary glands. 

 The interlobular bile ducts form networks in the inter- 

 lobular tissue. Towards the hilum they become of 

 great diameter, and their wall is made up of fibrous 

 tissue, with non-striped muscular tissue. Small 

 mucus-secreting glands are in their wall, and open 

 into their lumen. 



The wall of the hepatic duct, and of the gall 

 bladder, are merely exaggerations of this structure. 



282. The hepatic artery follows in its ramification 

 the interlobular veins. The arterial branches form 

 plexuses in the interlobular tissue, and they supply 

 the capillary blood-vessels of the interlobular con- 

 nective tissue, and especially of the bile ducts. The 

 capillary blood-vessels of the bile ducts join so as 

 to form small veins which finally empty themselves 

 into the interlobular veins. The anastomoses of the 

 capillary blood-vessels, derived from the arterial 

 branches, directly with the capillary blood-vessels of 

 the acini, are insignificant (Cohnheim and Litten). 

 The serous covering of the liver contains special 

 arterial branches rami capsulares. Networks of lym- 

 phatics deep lymphatics are present in the inter- 

 lobular connective tissue, forming plexuses around 

 the interlobular blood-vessels and bile ducts, and 

 occasionally forming a perivascular lymphatic around 

 a branch of the hepatic vein. Within the acinus, 

 the lymphatics are represented only by spaces and 

 clefts existing between the liver cells and capillary 

 blood-vessels ; these are the intralobular lymphatics 

 (Macgillivry, Frey, and others). They anastomose 

 at the margin of the acinus with the interlobular 

 lymphatics. 



In the capsule of the liver is a special network 



