Single umbilical vein carry oxigenated blood placenta towards the fetus. While it is moving towards the heart of the fetus one branch will give blood to the fetal liver. Then the umbilical vein enter into the inferior vena cava through ductus venosus and it empty into right atrium.
From right atrium majority of the blood will move towards left atrium via foramen ovale and the remaining blood will move towards right ventricle throught tricuspid valve.
The blood in the left atrium will move towards left ventricle via biscuspid valve(mitral valve).
During systole the blood in the left ventricle move towards aorta and it supplies the body parts of fetus.
The blood in the right ventricle moves towards pulmonary system pressure is higher than the systemic pressure so blood will moves from pulmonary artery to aorta via ductus arteriosus.
Two umbilical artery carry deoxygenated blood from various parts of the fetal body towards the plecenta.
After the birth of the newborn ligamention venosum ductus arteriosus become ligamentum arteriosum and foramen ovale become fossa ovalis.
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