Find out the correct sequence in body wall of Ascaris

Options

A. Cuticle, epidermis, longitudinal muscles and circular muscles
B. Cuticle, epidermis and longitudinal muscles
C. Epidermis, cuticle, longitudinal muscles and circular muscles
D. Epidermis, longitudinal muscles, cuticle and circular muscles

Answer

To find out the correct sequence in the body wall of Ascaris, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Layers of the Body Wall**: The body wall of Ascaris consists of three main layers: the cuticle, epidermis, and muscular layer.

2. **Start from the Outer Layer**: The outermost layer of the body wall is the **cuticle**. This is a thick, protective layer that serves as the first line of defense against the environment.

3. **Next Layer**: Beneath the cuticle is the **epidermis** (also referred to as the hypodermis). This layer is non-cellular and transparent, lying directly below the cuticle.

4. **Innermost Layer**: The third layer is the **muscular layer**. This layer consists of longitudinal muscles that are organized into four columns: two dorsal lateral and two ventral lateral. It is important to note that circular muscles are absent in Ascaris.

5. **Correct Sequence**: Therefore, the correct sequence from the outermost to the innermost layer is:
- **Cuticle**
- **Epidermis**
- **Longitudinal Muscles**

### Final Answer:
The correct sequence in the body wall of Ascaris is:
**Cuticle → Epidermis → Longitudinal Muscles**