Multiple choice

Ovum in graffian follicles is surrounded by three layers. What is the middle layer known as?

  1. Zona pellucida

  2. Theca interna

  3. Corona radiata

  4. Vitelline membrane

  5. Discus proliferous

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C Correct answer
Explanation

The corona radiata is the middle layer of the cumulus oophorus (graffian follicle).