And during fertilization, when the sperm combines with the egg to form the zygote and the zygote makes its way into the uterus, the zygote will attach itself, it will implant itself onto the endometrium and it will begin to grow. Because the endometrium is the structure that provides the nutrients, the minerals and the oxygen that is needed for the growth and development of that zygote. Now, notice we also have the cervix, which is basically the lower portion of our uterus. And it connects our upper portion of the uterus into our vagina. And this is the vagina. It's the vaginal cavity.