What does FSH stimulate in the female reproductive system every month?

Follicle-stimulating hormone (FSH) plays a crucial role in the female reproductive cycle, particularly in the early stages of ovarian function. Each month, during the follicular phase of the menstrual cycle, FSH is secreted by the pituitary gland and stimulates the growth and maturation of ovarian follicles. These follicles contain immature egg cells, and FSH promotes their development into mature eggs, preparing them for ovulation.

As the ovarian follicles mature, they produce estrogen, which ultimately leads to further hormonal changes that can result in ovulation and the preparation of the uterine lining for potential implantation. While FSH is essential for egg maturation, it does not directly cause the release of eggs (which is the role of luteinizing hormone or LH), nor does it trigger menstruation or the growth of the endometrium, which are influenced by different hormones in the menstrual cycle.

Understanding this cycle and the specific functions of FSH helps clarify its essential role in female fertility and reproduction.