Which structure in an ovary is characterized by a fluid filled cavity called antrum?

Dear Student,

The primary oocytes formed during embryonic development get surrounded by layers of granulosa cells and are then called primary follicles. The primary follicles get surrounded by more layers of granulosa cells and from secondary follicles which soon get transformed into  tertiary follicles  that have characteristic fluid-filled cavity called antrum. This tertiary follicle further changes into the  Graafian follicle .

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