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Layers of an ovum from outside to inside...

Layers of an ovum from outside to inside is

A

corona radiata, zona pellucida and vitelline membrane

B

zona pellucida, corona radiata and vitelline membrane

C

vitelline membrane, zona pellucida and corona radiata

D

zona pellucida, vitelline membrane and corona radiata.

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The correct Answer is:
To answer the question regarding the layers of an ovum from outside to inside, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Outermost Layer**: The outermost layer of the ovum is called the **Corona Radiata**. This layer consists of irregularly shaped cells and serves as the first barrier that sperm must penetrate. 2. **Identify the Next Layer**: Beneath the Corona Radiata is the **Zona Pellucida**. This is a glycoprotein layer that surrounds the plasma membrane of the ovum and plays a crucial role in fertilization by allowing only one sperm to penetrate. 3. **Identify the Space Between Layers**: After the Zona Pellucida, there is a space known as the **Perivitelline Space**. This space is located between the Zona Pellucida and the ovum itself. 4. **Identify the Innermost Layer**: Finally, the innermost layer is the **Plasma Membrane** (or Vitelline Membrane) of the ovum. This is the actual membrane that encloses the cytoplasm of the ovum. ### Final Sequence from Outside to Inside: - **Corona Radiata** - **Zona Pellucida** - **Perivitelline Space** - **Plasma Membrane (Vitelline Membrane)**
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