332 



THE ANATOMY OP THE HOESE. 



the siMobular vein. By the union of these sublobular vems through- 

 out the liver, the larger hepatic venous trunks are formed ; and these, 



as already seen, enter the pos- 

 terior vena cava in the anterior 

 fissure of the liver. 



The Hepatic Abteey is a 

 branch of the coeliao axis. It 

 enters the liver with the portal 

 vein, and ramifies with it. It 

 has three sets of branches : (1) 

 capsular branches, to the tunica 

 propria; (2) vaginal branches, 

 to Glisson's capsule and the 

 vessels within it ; and (3) inter- 

 ^'<*- 41- lobular branches, whose capil- 



Tbansverse Section through the Hepatic Lobules laries pasS into the lobule, 



i,i,i. Interlobular veinrinding in the intmlobular ^hcrC they help to form the 

 capillaries ; c c. Central veins joined by the intra- intralobvilar plexUS, and enter 

 lobular capillaries. At a, a. the capillaries of one ^ ' 



lobule communicate with those adjacent to it. the Central Vein. The Capil- 



laries of the vaginal and capsular branches terminate in veins that johi 

 the portal vessels. 



The Liver Cells. — These are granular nucleated masses of protoplasm, 

 often containing fat particles. They are arranged in columns between 

 the strands of the intralobular plexus of capillaries. 



The Bile Passages begin within the lobule as a network of fine canals 

 — the bile capillaries — tunnelled at the lines of apposition of the liver 

 cells. At the periphery of the lobule these become continuous with 

 interlobular bile ducts having a proper wall and a simple columnar 

 epithelial lining. The interlobular bile ducts unite to form the larger 

 ducts that accompany the blood-vessels in the portal canals, and these 

 finally form the main bile duct, which passes in the gastro-hepatic 

 omentum to perforate the wall of the duodenum. 



structueb op the spleen. 



The spleen, like the liver, possesses two coats, viz., an outer serous or 

 peritoneal coat, and a deeper fibrous tunic, or tunica propria. The latter 

 is composed of white fibrous tissue with a considerable admixture of 

 elastic and non-striped muscular fibres. It detaches from its inner sur- 

 face a multitude of trabeculcB, which by their anastomosis form a fibrous 

 framework in the interior of the organ. The interspaces of this frame- 

 work are occupied by a grumous material — the splenic pmlp. If the cut 

 surface of the spleen be washed beneath a tap, the pulp may be removed 

 and the fibrous trabeculse rendered very evident. 



The Splenic AHery, a division of the coeliac axis, is a very large 



