The antral follicle is characterized by the presence of a cavity filled with follicular fluid called the antrum. This follicle may continue its development to a Graafian follicle (also called a preovulatory follicle) in a gonadotropin hormone-dependent manner.
The FSH hormone will promote the development of several of these antral follicles in each menstrual cycle. However, by a mechanism of selection and dominance, only one of them will complete its development and give rise to a preovulatory follicle. The rest of the antral follicles that are not able to continue their maturation will be lost by atresia.