A ridge or fold, such as the rugae of the stomach, which are large folds in the mucous membrane of that organ. [ http://en.wikipedia.org/wiki/Rugae http://medical-dictionary.thefreedictionary.com/Rugal+folds ]
Term information
A ridge or fold, such as the rugae of the stomach, which are large folds in the mucous membrane of that organ.
As currently defined this encompasses only mucuous membranes, and not for example rugal folds of skin such as the scrotal rugae