Rugae (Redirected from Rugal folds)

Illu stomach.jpg
Diagram from
Rugae can be seen within stomach.
Anatomical terminology
Rugae folds behind the anterior teeth in the hard palate of the mouth

In anatomy, rugae are a series of ridges produced by folding of the wall of an organ.[1] Most commonly rugae refers to the gastric rugae of the internal surface of the stomach.


The purpose of the gastric rugae is to allow for expansion of the stomach after the consumption of foods and liquids.


Rugae can appear in the following locations in humans:

Difference between rugae and intestinal villi

Rugae are only evident when an organ or tissue is deflated or relaxed. For example, rugae are evident within the stomach when it is deflated. However, when the stomach distends, the rugae unfold to allow for the increase in volume. On the other hand, plicae remain folded regardless of distension as is evident within the plicae of the small intestine walls.


  1. ^ Moore, Keith L & Dalley, Arthur F (2006). Clinically Orientated Anatomy (5 ed.). Philadelphia: Lippincott Williams & Wilkins. p. 250.

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