Vaginal rugae are structures of the vagina that are transverse ridges formed out of the supporting tissues and vaginal epithelium in females. The rugae contribute to the resiliency and elasticity of the vagina and its ability to distend and return to its previous state. The shape and structure of the rugae are supported and maintained by the lamina propria of the vagina and the anterior and posterior rugae. The anterior and posterior columnae rugae are transverse vaginal support structures between which the transverse rugae exist. The cross section of the vagina normally forms a shape that resembles the letter 'H' due to these structures.
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In anatomy , rugae are a series of ridges produced by folding of the wall of an organ. A purpose of the gastric rugae is to allow for expansion of the stomach after the consumption of foods and liquids. This expansion result in greater surface area, thereby helpful in absorbing nutrients. It also increases volume of the stomach to hold large amount of food. 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.