Rugae/transitional epithelium is the feature of the bladder predisposes it to being able to stretch and relax repeatedly.
Rugae is a term used in anatomy refers to a series of ridges produced by folding of the wall of an organ. most typically the term is applied to the inner surface of the stomach. The stomach rugae is also seen during esophagogastroduodenoscopy or in radiological studies.
The function of the rugae is to permit the stomach, or other tissue, to expand when needed. When the stomach isn't full, the rugae are folds within the tissue. However, because the stomach sills it expands by unfolding the rugae. They function to regulate what enters and exits the stomach, and when.
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