Rugae may be found in the:

• A. Esophagus
• B. Stomach
• C. Small intestine
• D. Large intestine

Answer: (B)

Rugae are folds in the lining of the stomach formed by mucosa and submucosa. They allow the stomach to expand as it fills with food and liquids, increasing capacity without requiring a thicker wall. When the stomach is empty, these folds are prominent, and they flatten out as the stomach stretches to accommodate contents. This feature is specific to the stomach; the esophagus lacks rugae, and the small and large intestines have other folding structures (like plicae circulares and villi) that serve different roles in digestion and absorption. So rugae are found in the stomach.