Select the correct structural sequence of alimentary canal facing from inside to outside.

Options

A. Serosa `to` Muscularis `to` Submucosa `to` Mucosa
B. Muscularis `to` Serosa `to` Mucosa `to`Submucosa
C. Mucosa `to` Submucosa `to` Muscularis `to` Serosa
D. Submucosa `to` Mucosa `to` Muscularis `to` Serosa

Answer

To solve the question regarding the correct structural sequence of the alimentary canal from the inside to the outside, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Layers of the Alimentary Canal**: The alimentary canal consists of four main layers, which are arranged from the innermost to the outermost. These layers are:
- Mucosa
- Submucosa
- Muscularis
- Serosa

2. **Start from the Innermost Layer**: The innermost layer is the **Mucosa**. This layer is responsible for the secretion of mucus and digestive enzymes, as well as absorption.

3. **Next Layer - Submucosa**: After the mucosa, the next layer is the **Submucosa**. This layer contains blood vessels, lymphatics, and nerves that support the mucosa.

4. **Third Layer - Muscularis**: Following the submucosa, we have the **Muscularis** layer. This layer is made up of smooth muscle and is responsible for the peristaltic movements of the alimentary canal.

5. **Outermost Layer - Serosa**: Finally, the outermost layer is the **Serosa**. This layer provides a protective outer covering and reduces friction between the alimentary canal and surrounding organs.

6. **Compile the Sequence**: Putting it all together, the correct structural sequence of the alimentary canal from the innermost to the outermost layer is:
- Mucosa
- Submucosa
- Muscularis
- Serosa

### Final Answer:
The correct structural sequence of the alimentary canal facing from inside to outside is:
**Mucosa, Submucosa, Muscularis, Serosa.**