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  4. The non-cellular layer of the mature ovum is:

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Q. The non-cellular layer of the mature ovum is:

NTA AbhyasNTA Abhyas 2020Human Reproduction

Solution:

In females, the ovum is alecithal i.e. yolk is absent. The ovum membrane is the vitelline membrane. It is surrounded by zona pellucida. In between the vitelline membrane and zona pellucida there is a perivitelline space. Zona is a non cellular layer that prevents sticking of the ovum in the oviduct and thus prevents ectopic pregnancy. Surrounding this is the layer known as corona radiata that is secreted by granulosa cells.