Which vein is described as a continuation of the left portal vein that extends down to the umbilicus?

The paraumbilical veins are small veins that are considered to be continuations of the left portal vein. They extend down toward the umbilicus and are located beneath the falciform ligament in the abdominal cavity. When there is portal hypertension, these veins can become distended and are often visible as "caput medusae," a pattern of superficial veins around the umbilicus.

Understanding the role of the paraumbilical veins is crucial in the context of liver disease, as increased pressure in the portal venous system can lead to the development of collateral circulation. This anatomical detail is essential for anyone studying abdominal anatomy and pathologies related to portal hypertension and liver function.