Assertion: umbilical vein | /r/CapableOf | degenerate into fibrous remnants
Facets:
Source sentences:
text: Within the infant, the umbilical vein and ductus venosus (which carried blood to the liver and the inferior vena cava) close up and degenerate into fibrous remnants known as the round ligament of the liver and the ligamentum venosum respectively.