A follicle with a single layer of cuboidal granulosa cells is called a primary follicle. A follicle with more than one layer of granulosa cells is called a secondary follicle. Eventually, fluid-filled vesicles occur n the granulosa cell layer, forming early antral follicles.
A secondary ovarian follicle is a maturing ovarian follicle including of an oocyte encircled by two or more layers of tall, keeping granulosa cells.
Thus, A secondary ovarian follicle is a maturing ovarian follicle consisting of an oocyte surrounded by two or more layers of tall, supporting granulosa.
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