COLLATERAL VENOUS CIRCULATION. 



Right 



innominate vein 



Internal 

 mammary vein. 



Thoracico- 

 epigastric vein. 



Superficial 

 superior 

 epigastric vein. 



Parumbilical 

 veins. 



Venous circle of 

 umbilicus. 



Radicles of 

 azygos vein. 



Deep inferior 

 epigastric veins 

 Right common 

 iliac vein. 



Superficial 

 inferior 

 epigastric vein. 



External iliac 

 vein. 



Left innominate 

 vena. 



Superior vena 

 cava. 



Vena azygos 

 major. 



(Esophageal 

 veins and 

 plexus. 



Coronary vein 

 of stomach. 

 Portal vein. 



Splenic vein. 

 Superior 

 mesenteric vein. 

 Retroperitoneal 

 venous plexus. 



Inferior 



mesenteric vein. 

 Inferior vena 

 cava. 



Left common 

 iliac vein. 



Superior 

 hsemorrhoidal 

 vein. 



Internal iliac 

 vein. 



Hsemorrhoidal 

 plexus. 



FIG. 47. A diagram to show the communications which exist between the superior 

 and inferior caval veins, and also those which occur between the portal and 

 systemic veins. (After 0. Schultze, much modified.) 



[To face page 338. 



