Ligamentum teres is a remnant of which fetal vessel?

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This structure is the fibrous remnant of the umbilical vein. In fetal life the umbilical vein carries oxygenated blood from the placenta to the fetus, delivering it to the liver and systemic circulation. After birth, the vein closes and becomes a fibrous cord known as the ligamentum teres hepatis, running in the free edge of the falciform ligament from the umbilicus to the porta hepatis. This explains why the ligament is called the round ligament. By contrast, the ductus venosus becomes the ligamentum venosum, and the umbilical arteries become the medial umbilical ligaments; the portal and hepatic veins are normal hepatic vessels, not remnants in the same way.