Origin of hepatic veinsA, vitellineB. Subcardinalc. Umbilical

The hepatic veins originate from the vitelline veins during embryonic development. Here's a step-by-step explanation:

1. The vitelline veins are part of the embryonic circulatory system, which carry blood from the yolk sac to the embryo during early development.

2. As the embryo develops, the vitelline veins form a network of vessels around the developing digestive tract.

3. Part of this network of vitelline veins goes on to form the hepatic veins. These veins drain blood from the liver and empty into the inferior vena cava.

4. The subcardinal and umbilical veins do not contribute to the formation of the hepatic veins. The subcardinal veins primarily contribute to the formation of the renal veins, and the umbilical veins become part of the circulatory system of the fetus, carrying oxygenated blood from the placenta to the fetus. After birth, the umbilical veins close off and become fibrous cords.