The contain microscopic structures called follicles which contain a potential egg cell and granulosa cells.

It seems you are referring to ovarian follicles, which are essential structures in the female reproductive system. Follicles are found in the ovaries and play a crucial role in the development of eggs and the production of hormones.

1. Follicle Composition: Each follicle consists of an oocyte (the potential egg cell) surrounded by granulosa cells. These granulosa cells provide support and nutrition to the developing oocyte.

2. Stages of Follicle Development: Follicles undergo several stages of development, starting from the primordial stage (tiny, inactive) to the primary, secondary, and finally the mature (Graafian) follicle which is ready to release an egg during ovulation.

3. Hormonal Regulation: The growth and maturation of follicles are regulated by hormones, including follicle-stimulating hormone (FSH) and luteinizing hormone (LH), which are produced by the pituitary gland.

4. Egg Release: During ovulation, the mature follicle ruptures to release the egg into the fallopian tube, where it may meet sperm for fertilization.

Understanding ovarian follicles and their functions is crucial in fields like reproductive biology and medicine, particularly in understanding fertility, menstrual cycles, and various reproductive health issues.