THE VASCULAR SYSTEM 



383 



right subclavian artery 



innominate artery 

 jugular veins 



innominate vein 

 subclavian vein 



anterior vena caVa 



through foramen ovale 

 right atrium 



posterior vena cava 



to pulmonary orifice 

 from 



hepatic 

 sinusoids 



umbilicus 



umbilical 

 artery 



coeliac artery 



left common carotid artery 

 left subclavian artery 



ductus arteriosus 

 left pulmonary artery 

 pulmonary veins 



left atrium 



mitral valve 



to aortic orifice 

 from left ventricle 



anterior mesenteric a. 



dorsal aorta 



posterior mesenteric a. 



common iliac artery 

 external iliac artery 

 internal iliac artery 



hypogastric artery 



Fig. 321. — Diagrammatic plan of circulation of mammalian foetus just before birth. 

 (From Patten's "Embryology of the Pig.") 



