Cells of corona radiata disperse just

Options

A. After fertilazation
B. Before implantation
C. At the time of coming in contact with sperm
D. After cleavage.

Answer

To answer the question regarding when the cells of the corona radiata disperse, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Corona Radiata**: The corona radiata is a layer of cells that surrounds the ovum (egg) and is crucial for the fertilization process. It consists of granulosa cells that provide support and nutrients to the egg.

2. **Role of the Corona Radiata in Fertilization**: Before fertilization can occur, the sperm must penetrate the layers surrounding the egg, including the corona radiata and the zona pellucida.

3. **Dispersal of the Corona Radiata Cells**: The cells of the corona radiata disperse to facilitate the entry of sperm into the ovum. This dispersal is necessary to allow the sperm to reach the egg and successfully fertilize it.

4. **Timing of Dispersal**: The dispersal of the corona radiata cells occurs just before fertilization. This is a preparatory step that ensures that the sperm can access the egg without obstruction.

5. **Conclusion**: Based on the understanding of the fertilization process and the role of the corona radiata, we conclude that the cells of the corona radiata disperse just before fertilization.

### Final Answer:
The cells of the corona radiata disperse just before fertilization.

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