The follicular antrum is the portion of an ovarian follicle filled with follicular fluid. Appearance of the follicular antrum during follicular maturation is the first sign that a follicle has reached the next stage of maturation. It has changed from a primary follicle to a secondary follicle.

Follicular antrum
Details
Identifiers
Latinantrum folliculare
FMA18675
Anatomical terminology

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