Outermost layer in the wall of alimentary canal is
(a) Muscularis
(b) Serosa
(c) Submucosa
(d) Mucosa

Options

A. Muscularies
B. Serosa
C. Submucosa
D. Mucosa

Answer

To solve the question regarding the outermost layer in the wall of the alimentary canal, we will analyze the options provided and understand the structure of the alimentary canal.

### Step-by-Step Solution:

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

2. **Examine Each Option**:
- **(a) Muscularis**: This is the second layer of the alimentary canal, located beneath the serosa. It is made up of two layers of muscle (inner circular and outer longitudinal).
- **(b) Serosa**: This is the outermost layer of the alimentary canal. It serves as a protective layer and is made of connective tissue.
- **(c) Submucosa**: This layer is located beneath the mucosa and above the muscularis. It contains blood vessels, nerves, and connective tissue.
- **(d) Mucosa**: This is the innermost layer of the alimentary canal, which comes in direct contact with the contents of the canal.

3. **Determine the Correct Answer**:
Since we are looking for the outermost layer, we can conclude that the correct answer is **(b) Serosa**.

### Final Answer:
The outermost layer in the wall of the alimentary canal is **(b) Serosa**.

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