Follow the pathway of the oocyte from the time it leaves the ovary until it arrives in the uterus.
The oocyte travels down the uterine tube. The follicle left behind becomes the corpus luteum, which secrets progesterone and estrogen to stimulate build up of uterine endometrium. If fertilization occurs, zygote continues traveling down the uterine tube, dividing to produce mass of cells. Eventually it will lodge in the endometrial lining. If the oocyte is not fertilized within about 10-13, the corpus luteum beings to atrophy, leaving only a small bit of scar tissue called the corpus albicans. Eventually it, too, will vanish. The uterine lining is sloughed off.