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what is the  function  of  rugae  in  stomach?

Rugae is a term that commonly means series of ridges produced by folding of the wall of an organ. 

The innermost layer  forms irregular folds  in the stomach called rugae. Gastric rugae can also be called  gastric folds. They allow the stomach, or other tissue, to expand when needed, as in time when  the stomach fills. The rugae in stomach unfolds at the time of filling in order to provide more surface for food.

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The rugae R the small folds in an organ. The function of these folds R to increase the surface area.

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Rugae is a term used in anatomy that refers to a series of ridges produced by folding of the wall of an organ. Most commonly the term is applied to the internal surface of the stomach (gastric rugae). The function of the rugae is to allow the stomach, or other tissue, to expand when needed. When the stomach is not full, the rugae are folds in the tissue. However, as the stomach fills it expands by unfolding the rugae. When the stomach empties again, it refolds and the rugae increase to their former size.

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