Lateral view of cross-sectioned uterus as well as fallopian tubes and ovaries. Every month, an egg is released and drawn into a fallopian tube from one of the two ovaries. If fertilization occurs, the egg moves down the fallopian tube and implants itself in the wall of the uterus, a pear-shaped, hollow, muscular organ that will grow and expand to support a developing baby. If the egg is not fertilized, the egg and uterine lining are shed during menstruation, and will pass out of the uterus through the cervix to the muscular vagina, and out of the body.

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