Which structure is formed from the remnant of the ductus venosus after birth?

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During fetal life the ductus venosus shunts a portion of oxygenated blood from the umbilical vein directly to the IVC, bypassing the liver. After birth, this vessel closes and leaves behind a fibrous band called the ligamentum venosum. This ligament runs along the visceral surface of the liver in the fissure for the ligamentum venosum, separating the caudate lobe from the left lobe. So the remnant of the ductus venosus becomes the ligamentum venosum.

To place it in context: the other fetal remnants form different structures—ligamentum teres hepatis from the obliterated umbilical vein, the hepatoduodenal ligament as part of the lesser omentum containing the portal triad, and the coronary ligament attaching the liver to the diaphragm.