2.3 Menstrual cycle

. Menstrual cycle The menstrual or ovarian cycle occurs approximately once in every / days during the reproductive life of the female from menarche (puberty) to menopause except during pregnancy. The cycle of events starting from one menstrual period till the next one is called the menstrual cycle during which cyclic changes occurs in the endometrium every month. Cyclic menstruation is an indicator of normal reproductive phase (Fig. . ) . Menstrual cycle comprises of the following phases . Menstrual phase . Follicular or proliferative phase . Ovulatory phase . Luteal or secretory phase