Hepatic vascular shunts

Schematic images showing development of the hepatic venous system, which starts to develop in the fifth week of intrauterine life.

Vitelline veins form the hepatic sinusoids. Left umbilical vein connects to the right vitelline vein via the ductus venosus. Anastomotic network around the duodenum forms the portal vein.

LCV, left cardinal vein; RCV, right cardinal vein; RUV, right umbilical vein; LUV, left umbilical vein; SC, superior communication; MC, middle communication; IC, inferior communication.