1) Wrinkles, to botanists 
==Composition== 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). ==Function== The function of the rugae is to allow the stomach, or other tissue, to expand when needed. When the stomach is not full...
• (pl. ) of Ruga
elevated folds or wrinkles of soft tissue in the front part of the palate.
raised ridges of epithelium, each with its core of lamina propria, found on the anterior wall of the hard palate.
(roo;je) The folds or ridges of the mucosa of an organ.