After birth, the ductus venosus becomes?

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After birth, the ductus venosus closes and becomes a fibrous cord known as the ligamentum venosum, located in the fissure for the ligamentum venosum on the visceral surface of the liver. This remnant marks the switch from fetal to neonatal circulation, where blood no longer bypasses the liver. For context, the remnant of the umbilical vein is the ligamentum teres (round ligament) in the edge of the falciform ligament, and the falciform ligament itself is a peritoneal fold attaching the liver to the anterior abdominal wall and diaphragm.