Rugae are the folds in the stomach that allow it to expand when it is full and increase surface area.
The rugae have the purpose of allowing the stomach and other tissue to stretch as necessary to aid in food digestion. Gastric rugae are ridges of muscle tissue that line the stomach. The body's digestion system depends on the gastric rugae. When the stomach is not yet full, the gastric rugae fold into the stomach tissue. The rugae open up when the stomach is full, allowing the stomach to grow. The rugae spread when the stomach empties, returning the stomach to its former size. Only when a tissue or organ is deflated or relaxed are gastric rugae visible in radiological investigations.
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