The non-cellular layer of the mature ovum is

Options

A. Corona radiata
B. Zona pellucida
C. Theca interna
D. Granulosa

Answer

To solve the question regarding the non-cellular layer of the mature ovum, we can follow these steps:

### Step 1: Understand the Structure of the Mature Ovum
The mature ovum, or egg cell, has several layers surrounding it. These layers include:
- **Corona Radiata**: The outermost layer, which consists of follicular cells.
- **Zona Pellucida**: The layer beneath the corona radiata, which is a non-cellular glycoprotein layer.
- **Oocyte**: The actual egg cell, which contains the nucleus and cytoplasm.

### Step 2: Identify the Non-Cellular Layer
From the layers mentioned:
- **Corona Radiata** is made up of cells (follicular cells).
- **Zona Pellucida** is a non-cellular layer composed of glycoproteins.
- **Theca Interna** and **Granulosa** are also cellular structures associated with the ovarian follicles.

### Step 3: Conclusion
The non-cellular layer surrounding the mature ovum is the **Zona Pellucida**. Therefore, the correct answer to the question is **Zona Pellucida**.

### Final Answer:
The non-cellular layer of the mature ovum is **Zona Pellucida**.

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