A noncellular thick glycoprotein rich layer that is present around oocyte

Options

A. Zona pellucida
B. Corona radiata
C. Discus proligerus
D. Membrana granulosa

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks for a specific layer that surrounds the oocyte, which is described as a noncellular, thick, glycoprotein-rich layer.

2. **Identifying the Options:**
The options given are:
- Option 1: Zona Pellucida
- Option 2: Corona Radiata
- Option 3: Discus Proligerus
- Option 4: Membrana Granulosa

3. **Analyzing Each Option:**
- **Zona Pellucida:** This is known to be a thick, glycoprotein-rich layer that surrounds the oocyte. It serves protective functions and plays a crucial role in fertilization.
- **Corona Radiata:** This layer consists of follicular cells that surround the ovum after it has been released. It is not a glycoprotein layer surrounding the oocyte itself.
- **Discus Proligerus:** This term refers to a structure associated with the ovarian follicle, but it does not describe a layer surrounding the oocyte.
- **Membrana Granulosa:** This is a cellular layer that surrounds the oocyte, but it is not a noncellular layer.

4. **Conclusion:**
Based on the analysis, the correct answer is **Option 1: Zona Pellucida**, as it is the only option that fits the description of a noncellular, thick, glycoprotein-rich layer surrounding the oocyte.

**Final Answer:**
The noncellular thick glycoprotein rich layer that is present around the oocyte is called the **Zona Pellucida**.

---