video 3'46 : https://youtu.be/Vl2wRbO8LZU?si=n8JtFXBGbMH9_DUl

video 9'52 : https://youtu.be/3Lt9I5LrWZw?si=p7hq8v3LQ9W62h2W This video goes through the hormonal and physiological changes that occur during the menstrual cycle. CORRECTION : FSH does not start the development of the follicles. The follicles are constantly developing from primordial follicles to primary follicles to secondary follicles. FSH stimulates further development of a number of these into mature follicles at the start of the menstrual cycle (rather than initiating the development as the video suggests).