Duodenal layer with glands is

Options

A. Sub-mucosa
B. Mucosa
C. Serosa
D. Muscularis

Answer

To answer the question "Duodenal layer with glands is," we need to identify which layer of the duodenum contains glands. Here’s a step-by-step solution:

### Step 1: Understand the Structure of the Duodenum
The duodenum, which is the first part of the small intestine, has a wall composed of four distinct layers:
1. Mucosa
2. Submucosa
3. Muscularis
4. Serosa

### Step 2: Identify the Function of Each Layer
- **Mucosa**: This is the innermost layer that is involved in the absorption and secretion of digestive enzymes and nutrients.
- **Submucosa**: This layer contains connective tissue and is where the glands are located, specifically the Brunner's glands, which secrete alkaline mucus.
- **Muscularis**: This layer consists of smooth muscle that aids in peristalsis and movement of food.
- **Serosa**: This is the outermost layer that provides a protective covering.

### Step 3: Focus on the Glands
The question specifically asks for the layer that contains glands. Among the four layers, the **submucosa** is the one that contains Brunner's glands. These glands secrete alkaline mucus, which helps neutralize stomach acid and provides an optimal pH for intestinal enzymes.

### Step 4: Conclusion
Based on the information gathered, the correct answer to the question is:
**Submucosa**

### Final Answer
The duodenal layer with glands is **submucosa**.

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