4. Ovarian and Menstrual cycles

4.3. Hormonal Profiles Across the Cycle

  • Hypothalamus → GnRH → Anterior Pituitary → FSH & LH → Ovary:

◦       Follicle development → Estrogen ↑

◦        LH surge → Ovulation

◦        Corpus luteum → Progesterone ↑

  • Uterus:

◦       Estrogen → Endometrial proliferation

◦       Progesterone → Secretory preparation

◦       Hormone withdrawal → Menstruation