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In the structure of a mature **Graafian follicle**, the fluid-filled cavity between the oocyte and the membrana granulosa is called: 
AAntrum
BCumulus oophorus
CZona pellucida
DCorona radiata
Answer & Solution
Correct answer: A. Antrum
The **antrum** is the fluid-filled cavity (containing liquor folliculi) inside the Graafian follicle. Cumulus oophorus = oocyte + surrounding granulosa cells; zona pellucida is a non-cellular layer around the oocyte; corona radiata is the innermost follicular cell layer.
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