The alimentary canal of a deceased individual was cut transversely for examination of the arrangement of layers from outside to inside. Select the correct sequence of arrangement for the layers examined.

Options

A. Serosa `rarr` Longitudinal muscles `rarr` Circular muscles `rarr` Mucosa `rarr` Submucosa
B. Mucosa `rarr` Submucosa`rarr` Circular muscles `rarr`Longitudinal muscle `rarr`Serosa
C. Serosa `rarr` Longitudinal muscles `rarr` Circular muscles `rarr` Submucosa `rarr` Mucosa
D. Serosa `rarr` Longitudinal muscles `rarr` Oblique muscles `rarr` Circular muscles `rarr` Submucosa `rarr` Mucosa

Answer

To determine the correct sequence of layers of the alimentary canal from outside to inside, we need to identify the layers that make up the wall of the alimentary canal. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Layers of the Alimentary Canal
The wall of the alimentary canal consists of four main layers:
1. **Serosa**: The outermost layer, which is a protective layer.
2. **Muscularis**: This layer is further divided into two sub-layers:
- **Longitudinal Muscles**: These run along the length of the canal.
- **Circular Muscles**: These encircle the canal.
3. **Submucosa**: This layer contains blood vessels, nerves, and connective tissue.
4. **Mucosa**: The innermost layer, which is involved in absorption and secretion.

### Step 2: Arrange the Layers from Outside to Inside
Now, we will arrange these layers in the correct order from the outermost to the innermost:
1. **Serosa** (outermost)
2. **Muscularis**:
- **Longitudinal Muscles**
- **Circular Muscles**
3. **Submucosa**
4. **Mucosa** (innermost)

### Step 3: Final Arrangement
Putting it all together, the correct sequence from outside to inside is:
- **Serosa**
- **Longitudinal Muscles**
- **Circular Muscles**
- **Submucosa**
- **Mucosa**

### Conclusion
The correct answer is option C: **Serosa, Longitudinal Muscles, Circular Muscles, Submucosa, Mucosa**.

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