So this is the inferior venecrava. And notice, the inferior venecaiva carries the deoxygenated blood from the organs and tissues found at the bottom of that developing fetus. And when we have this intersection taking place, we have the mixing of the oxygenated and nutrient filled blood with the deoxynated blood. And so we form a partially oxygenated blood. And that's why we use a light purple color for the partially oxygenated blood. So this is essentially the inferior venecaba that eventually connects with a superior venecrava.