<prompt> Which of the following structure in foetal life becomes ligamentum teres in adult life?Umbilical aeryUmbilical veinDuctus venosusPoal radicles  <response>: The left umbilical vein persists as a channel that carries blood from the placenta through ductus venosus to the hepatic poion of the inferior venacava IVC while the right umbilical vein regresses. After bih, the left umbilical vein forms the ligamentum teres and the ductus venous the ligamentum venosum respectively. 