And eventually that morala will make its way to the cavity of the uterus. Now, inside the uterus, we have the lining of the uterus known as the endometrium. And the endometrium contains these special glands that secrete a nutritious fluid. And that fluid, which is found inside the cavity of the uterus is used to basically initiate the process known as blastulation. So once the moral is inside that cavity of the uterus, it undergoes blastulation to form a blastocyst. Now, recall that a blastocyst consists of three important structures.