Tags: Anatomical Structure.
Ovarian follicles are the basic units of female reproductive biology each of which is composed of roughly spherical aggregations of cells found in the ovary. They contain a single oocyte (immature ovum or egg). These structures are periodically initiated to grow and develop culminating in ovulation of usually a single competent oocyte in humans. These eggs/ova are developed only once every menstrual cycle (e.g. once a month in humans).
