The wall of alimentary canal from oesophagus to rectum possesses ________ layers.

Options

A. 2 layers
B. 3 layers
C. 4 layers
D. 5 layers

Answer

To answer the question about the number of layers in the wall of the alimentary canal from the esophagus to the rectum, we can follow these steps:

1. **Identify the Layers**: The wall of the alimentary canal consists of several distinct layers. These layers are organized from the outermost to the innermost.

2. **List the Layers**:
- **Serosa**: This is the outermost layer that provides protection and structure.
- **Muscular Layer**: This layer is further divided into two sub-layers:
- **Longitudinal Muscle Layer**: This is the outer layer of the muscular layer.
- **Circular Muscle Layer**: This is located beneath the longitudinal layer.
- **Submucosa**: This layer lies beneath the muscular layer and contains blood vessels, nerves, and connective tissue.
- **Mucosa**: This is the innermost layer that contains the epithelial lining and glands.

3. **Count the Layers**:
- Serosa (1)
- Muscular Layer (2) - which includes the longitudinal and circular muscles
- Submucosa (1)
- Mucosa (1)

In total, we have:
- 1 (Serosa) + 2 (Muscular Layer) + 1 (Submucosa) + 1 (Mucosa) = 5 layers.

4. **Final Answer**: The wall of the alimentary canal from the esophagus to the rectum possesses **5 layers**.