One of the following is fibrous layer of follicle

Options

A. Theca externa
B. Zona pellucida
C. Membrana granulosa
D. Vitelline membrane

Answer

To solve the question regarding which option represents the fibrous layer of the follicle, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the fibrous layer of the follicle. We need to identify which of the given options corresponds to this layer.

2. **Review the Options**: The options provided are:
- Theca externa
- Strona penucita
- Membrana granulosa
- Bilaminar membrane

3. **Define the Layers of the Follicle**:
- The **theca externa** is known to be a fibrous layer surrounding the follicle.
- The **strona penucita** is not a recognized term in this context.
- The **membrana granulosa** is a layer of granulosa cells that is not fibrous.
- The **bilaminar membrane** is not specifically known as a fibrous layer.

4. **Identify the Correct Answer**: Based on the definitions and characteristics of the layers:
- The **theca externa** is indeed the fibrous layer of the follicle.

5. **Conclusion**: Therefore, the correct answer to the question is **theca externa**.