Innermost layer of mucosa is made up of culumnar epithelium except `:`

Options

A. Oesophagus
B. Duodenum
C. Intestine
D. Stomach

Answer

### Step-by-Step Solution:

1. **Understanding Mucosa Structure**: The mucosa is the innermost layer of various organs in the body, including the gastrointestinal tract. It typically consists of epithelial cells, connective tissue, and a thin layer of muscle.

2. **Identifying Epithelial Types**: The epithelial cells in the mucosa can vary in type. The most common type found in the mucosa of the gastrointestinal tract is columnar epithelium, which is characterized by tall and slender cells.

3. **Recognizing the Exception**: While columnar epithelium is predominant in many parts of the gastrointestinal tract, there is an exception in the esophagus. The esophagus is lined with stratified squamous epithelium instead of columnar epithelium.

4. **Conclusion**: Therefore, the innermost layer of the mucosa is made up of columnar epithelium except in the esophagus, where it is made up of squamous epithelium.

### Final Answer:
The innermost layer of mucosa is made up of columnar epithelium except in the esophagus, which is lined with squamous epithelium.

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