And when this connection takes place, we have a further mixing of the oxygenated and deoxyted blood to form an even less partially oxygenated blood. And all that blood eventually reaches the right atrium of the heart. So, once again, oxygenated blood from the placentae is carried via the umbilical vein, this entire structure here. And notice we call it a vein and not an artery, because a vein, by definition, always carries blood towards the heart, while the artery always carries blood away from the heart. Now, as it travels past the underdeveloped liver of the fetus, the blood bypasses the liver via blood duct called the ductus Venosis, as shown in this diagram and as shown in this diagram here. So this structure here is our ductus Venosis.