What is an ovarian follicle?

An ovarian follicle is indeed a fluid-filled sac that contains an immature egg, also known as an oocyte. During the reproductive cycle, the follicle plays a crucial role in the development and maturation of the egg. As the follicle grows, it provides the necessary environment and nutrients for the oocyte to mature. This process is driven by hormonal changes in the body, particularly those involving follicle-stimulating hormone (FSH) from the pituitary gland. Once the egg matures, the follicle prepares for ovulation, at which point it releases the egg into the fallopian tube for potential fertilization. This understanding is central to reproductive biology, as the health and function of ovarian follicles directly impact fertility and overall reproductive health.