English to Italian Medical Medical (general) vene e circolazione

Sta descrivendo la figura dal titolo:
Fig. XXX Portal vein, V. portae hepatis and V. cava inferior;
semi-schematic representation; inflows into the V. cava inferior in blue; tributaries into the V. portae hepatis in purple.
Possible porto-caval anastomoses are highlighted by black circles.
The portal vein circulation has a special status within the systemic circulation (body circulation).
Here two capillary areas (intestine, liver) are connected in succession.
Prior to reaching the systemic circulation, venous blood from most unpaired abdominal organs (stomach, parts of the intestine, pancreas, spleen) is drained into the portal vein and from here into the liver.
In this way, many nutritional substances absorbed in the abdominal digestive organs reach the liver and are metabolised here.
Only after passing the liver does the blood reach the systemic circulation via the hepatic veins (Vv. hepaticae) into the cava inferior vein.

Magari è domanda ovvia: traducete Vena porta, vena porta epatica e vena cava inferiore?
Grazie.