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Where do we find corona radiata and zona pellucida?

Answer 1

Zona pellucida and corona radiata are protective covers seen around egg/ovum. Zona pellucida is non cellular while corona radiata is made up of cells.

Both the egg covers remain intact when egg is placed in the fallopian tube after ovulation. Sperm must penetrate through both before fertilising the egg.

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Answer 2

Logan Allen

In an ovarian follicle, the oocyte is surrounded by zona radiata, and the extracellular matrix that lies just outside the oocyte's plasma membrane is called zona pellucida.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.