The fetal structure that permits blood to flow from the umbilical vein to the inferior vena cava is the:
A)foramen magnum
B)foramen ovale
C)ductus venosus
D)ductus arteriosus

Question

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The ductus venosus is a fetal structure that allows oxygenated blood from the placenta to bypass the liver and flow directly into the inferior vena cava, which carries the blood to the heart. This structure closes shortly after birth, becoming the ligamentum venosum. The foramen magnum is a hole in the skull through which the spinal cord passes. The foramen ovale is a hole in the interatrial septum of the fetal heart, allowing blood to flow from the right atrium to the left atrium, bypassing the pulmonary circulation. The ductus arteriosus is a fetal blood vessel that connects the pulmonary artery to the aorta, allowing blood to bypass the lungs. It usually closes shortly after birth, becoming the ligamentum arteriosum.

The Fetal Structure That Permits Blood to Flow from the Umbilical