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Fig. 8B. —Schematic drawings of normal development of intrahepatic portal and hepatic venous systems. Drawing shows embryo at 8 weeks' gestation. Sinusoids start to develop, forming portal and hepatic venous systems. Right umbilical vein and cranial portion of left umbilical vein are regressed. Dorsal communication between caudal vitelline veins persists as part of main portal vein. Note tubular structure between left umbilical vein and inferior vena cava, which is called ductus venosus. DV = ductus venosus, LVV = left vitelline vein.





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