Menstrual Cycle - Phases

1. Menstrual (1-5 days): Endometrium breakdown; 2. Follicular/Proliferative (6-13 days): FSH/LH rise, estrogen peaks, follicles mature; 3. Ovulatory (Day 14): LH surge causes rupture of Graafian follicle; 4. Luteal/Secretory (15-28 days): Corpus luteum secretes Progesterone (maintains endometrium).