The corpus luteum secretes progesterone, which negatively feed back and inhibits the release of $LH$ and $FSH$. Generally, menstrual cycle have four phases $(i)$ Menstrual phase $(a)$ The soft tissue of endometrial lining of the uterus disintegrates causing bleeding. $(b)$ The unfertilized egg and soft tissue are discharged.$(c)$ It lasts $3-5$ days.$(ii)$ Follicular Phase/Proliferative Phase $(a)$ The primary follicles in the ovary grow and become a fully mature Graafian follicle.$(b)$ The endometrium of the uterus is regenerated due to the secretion of LH and FSH from anterior pituitary and ovarian hormone, estrogen.$(c)$ It least for about $10-14$ days.$(iii)$ Ovulatory Phase $(a)$ Rapid secretion of LH (LH surge) induces rupture of Graafian follicle, thereby leading to ovulation (release of ovum). $(b)$ It lasts for only about $48\; \mathrm{hr}$. $(iv)$ Luteal Phase/Secretor Phase $(a)$ In this phase the ruptured follicle changes into corpus luteum in the ovary and it begins to secrete the hormone progesterone. $(b)$ The endometrium thickens further and their glands secrete a fluid into the uterus. $(c)$ If ovum is not fertilized, the corpus luteum undergoes degeneration and this causes disintegration of the endometrium leading to menstruation. $(d)$ Oestrogen and progesterone levels rise during this phase. It lasts for only $1\; day$. $(e)$ During pregnancy all events of the menstrual cycle stop and there is no menstruation. The menstrual cycle permanently stops in females at the age of around $50\; years$. This is called menopause