Mucosa forms irregular folds (rugae) in the -

Options

A. ileum
B. Stomach
C. Jejunum
D. Colon

Answer

To solve the question regarding where mucosa forms irregular folds known as rugae, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Digestive System**:
- The digestive system has several layers, including the mucosa, submucosa, muscularis, and serosa. The innermost layer is the mucosa.

2. **Identify the Function of the Mucosa**:
- The mucosa is responsible for secretion and absorption. It can show modifications based on the region of the digestive tract.

3. **Recognize the Modifications in the Stomach**:
- In the stomach, the mucosa forms irregular folds. These folds are specifically known as rugae.

4. **Differentiate Between Regions**:
- While the stomach has rugae, the mucosa in the intestines forms structures called villi, which are different from rugae.

5. **Conclude the Answer**:
- Therefore, the mucosa forms irregular folds (rugae) specifically in the stomach.

### Final Answer:
The mucosa forms irregular folds (rugae) in the stomach.

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