follicular antrum

antral cavity

Region of ovarian follicle filled with follicular fluid.

Тип Organ
Родительская структура anatomical space
Латинское название antral cavity
FMA ID 18675

Часто задаваемые вопросы

When does the follicular antrum form?
The follicular antrum begins to form during the transition from secondary to tertiary follicle, typically in the late preantral stage. Accumulating follicular fluid secreted by granulosa cells coalesces into a single fluid-filled cavity. This process, called antrum formation or cavitation, marks a major turning point in folliculogenesis and is estrogen-dependent.
What is the structural significance of the follicular antrum?
The antrum divides the granulosa cells into two functional populations: the mural granulosa cells lining the follicle wall, and the cumulus granulosa cells surrounding the oocyte. This spatial organization determines how hormonal signals are processed and how the oocyte communicates with supporting cells through gap junctions.
How does the follicular antrum change during follicle maturation?
As the follicle matures from early antral to the preovulatory (Graafian) stage, the antrum expands dramatically — from microscopic to over 15 mm. This expansion is driven by continued fluid secretion and is reflected in ultrasound measurements used to monitor follicle development during fertility treatments.

Связанные структуры

mucus body coating mucous body coating mucus cocoon mucous cocoon Mullerian duct ductus paramesonephricus multi cell part structure cell part cluster multicellular anatomical structure multicellular structure multilaminar epithelium laminated epithelium multi-tissue structure multi-tissue structures multi-unit eye

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This content is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for medical decisions.

Data sources: Terminologia Anatomica, Foundational Model of Anatomy, Wikidata.