After birth, the umbilical vein becomes?

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After birth the umbilical vein, which in fetal life carries oxygenated blood from the placenta to the fetus, closes off and becomes a fibrous cord. This remnant is the ligamentum teres hepatis, also called the round ligament of the liver. It lies in the free edge of the falciform ligament, running from the umbilicus to the porta hepatis on the liver’s inferior surface. Its presence provides a useful anatomic landmark during imaging and surgery, marking where the fetal blood route once connected to the liver. The other peritoneal ligaments around the liver, such as the coronary ligaments, are different structures and are not remnants of fetal circulation.