THE BLOOD-VESSELS. 



97 



Fig. 93. — Vessels of the fat cells. The arterial (a), 

 venous branches (6 - ), with the rounded capillary net- 

 work of a fat lobule. 



trie mucus membrane, with its long, thin, tubular glands — 

 show a similar straight net-work. 



We are familiar, from Fig. 48, with the fat cells, large, 

 rounded structures. Their 

 capillary reticulum, in 

 correspondence with this, 

 forms rounded meshes 

 (Fig. 93). The small, ar- 

 terial branch (a), and the 

 small, venous branch (/;) 

 of an aggregation of these 

 fat cells appear very dis- 

 tinct. 



We shall later, at the 

 glands, become acquaint- 

 ed with very extended 

 organs of a racemose 

 structure. A rounded or 



elongated saccule (acinus) surrounds an aggregation of smaller 

 parenchyma cells. The acini are likewise circumvoluted by 

 a complete, quite 



similar, round net- 

 work, like the indi- 

 vidual fat cells. 



A handsome, very 

 characteristic ar- 

 .rangement is pre- 

 sented by the capil- 

 laries of the liver 

 (Fig. 94). The liver 

 — we shall return to 

 it in greater detail 

 subsequently — is di- 

 vided into so-called 

 lobules, into collections of radially arranged cells. The ex- 

 tensively developed capillary system maintains the same 

 arrangement— a rounded, stellate one. 

 5 



Fig. 94. — The capillary net work of the rabbit's liver, crossed 

 by a branch of the portal vein. 



