Uterine Changes

• Menstrual Phase

  Day 1-6
• Menstrual Phase


  Shedding of the endometrial lining due to lack of pregnancy.
• Menstrual Phase

  Estrogen and progesterone levels are low, which causes the endometrial lining to break down and be expelled as menstrual blood.
• Proliferative Phase

  Day 7-14
• Proliferative Phase


  Endometrial regeneration and thickening due to increased estrogen levels.
• Secretory Phase


  Preparation of the endometrium for possible pregnancy
• Secretory Phase

  If fertilization does not occur, the corpus luteum degenerates, and progesterone levels drop, triggering the next menstrual phase.
• Follicle-Stimulating Hormone (FSH): Stimulates the growth and maturation of ovarian follicles during the follicular phase.
• Luteinizing Hormone (LH): Peaks just before ovulation, triggering the release of the egg.
• Estrogen: Responsible for the thickening of the endometrial lining during the follicular phase. It promotes the regeneration of the uterine lining.
• Progesterone: Dominates the luteal phase, maintaining the endometrium for possible implantation and pregnancy.