And these embryonic blood vessels eventually connect to the umbilical arteries and the umbilical veins found inside the umbilical cord. And those structures, those blood vessels eventually directly connect to the circulatory system of that fetus. Now, once those digestive enzymes begin to break down the endometrium, the connective tissue, they also actually break down the vascular tissue. And that means those digestive enzymes released by the Corian eventually break down the maternal blood vessels found within the endometrium. And as soon as we rupture these blood vessels, the blood of the mother actually oozes out and leaks out into the endometrium, into the area surrounding these Corianic villi. And so we have the pooling of the mother's blood shown in the diagram as this light purple section.