ANGIOLOGY 253 



the posterior vena cava and the right into the right dorsal side. 

 These receive veins from the testicles in the male and from the ovary 

 in the female. 



The vena proventricularis inferior drains the stomach wall. One 

 biranch of this vein enters the left side of the posterior vena cava; 

 the other enters the vena proventricularis commmiis, which in turn 

 empties into the trunk of the anterior vena cava sinistra. 



The vense hepaticae consist of one large and several small 

 veins from each lobe of the Uver, and empty into the posterior 

 vena cava. 



Some small vessels come from the pericardium and the peritoneal 

 covering of the liver, and pass in the mediastinum to the trunk of 

 the posterior vena cava. 



In the region of the vena portalis: 



The liver receives almost all. the blood from the stomach, the 

 intestines, the pancreatic gland, the spleen, partly from the Hver 

 itself, and partly from the abdominal air-sacs. This blood enters 

 into the Hver through the vena portaUs dextra, the vena portaHs 

 sinistra, and the vena portaUs propria. 



In both lobes of the Uver these veins divide into numerous small 

 branches and collect again into two large short trunks, the vena 

 hepatica magna dextra (Fig. 70, No. 23), coming out of the right 

 lobe of the hver and the vena hepatica magna sinistra (Fig. 70, No. 

 24) coming out of the left lobe. These two vessels empty inferiorly 

 into the posterior vena cava. 



The vena portahs dextra receives the blood from the vena mesen- 

 terica communis. 



The vena mesenterica commums (Fig. 64, No. 36) receives the 

 blood from the vena coccygo-mesenterica (Fig. 70, No. 28) which 

 comes from the arcus hypogastricus and receives the vena hemor- 

 rhoidalis (Fig. 64, No. 37). This drains the cloaca and the bursa of 

 Fabricius, and it also receives veins from the rectum and from the 

 base of the caeca. 



The vena mesenterica anterior (Fig. 71, No. 3) accompanies the 

 anterior mesenteric artery, and collects the blood from numerous 

 vessels from the small intestine. 



The vena pancreatico-duodenalis (Fig. 64, No. 38) comes out of 

 the duodenum and the pancreas, along the right side of the stomach 

 and along both caeca. 



The vena proventriculo-lienalis (Fig. 64, No. 39) comes out of 



