Egg Freezing

Facts About Reproduction

Female Reproductive System

At the middle of the menstrual cycle, an ovary releases (ovulates) a mature egg, which the fallopian tube picks up—one end of the tube is right next to the ovary. The tube moves the egg back towards the uterus.

If sexual intercourse occurs around this time, the sperm swim through the lower opening to the uterus (cervix). They travel though the uterine cavity to the tubal openings and into each tube. Fertilization occurs in the outer third of the tube containing the egg.

Fertilized or not, the egg reaches the uterus about 4–5 days after ovulation. If healthy, a fertilized egg now contains 100–200 cells (and is now called a blastocyst). It imbeds into the uterine lining (endometrium).

If fertilization does not occur or the embryo is not viable, the uterine lining sheds about one week later (the menstrual period).

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