Physiology of Menstruation Menstruation (Greek Word, men - month) is month-to-month uterine blood loss outflowing through the vagina onto the vulva for 4-5 days every 28 days throughout the reproductive life of women from menarche to menopause. Menses are normal uterine features wherein the endometrium prepares to get pregnant. Blood loss originates from estrogen-progesterone topped endometrium. Lady obtains 13 menses in a year and also around 400 menses in her reproductive life. The menstruation of 28 days starts on the day of the beginning of menstruation (day 1) and also finishes on day 28 on begin of the next men. Menstruation signals that fertilization and embedding of the fertilized egg have actually not occurred on the coming before the menstrual cycle. Anovular menstruation is cyclical regular monthly blood loss from only estrogen keyed endometrium. This occurs for a couple of years after the beginning of menstruation (menarche) as well as before the final cessation of me...