<P> Vaginal rugae are structures of the vagina that are transverse ridges formed out of the supporting tissues and vaginal epithelium in females . Some conditions can cause the disappearance of vaginal rugae and are usually associated with childbirth and prolapse of pelvic structures . The rugae contribute to the resiliency and elasticity of the vagina and its ability to distend and return to its (nearly) previous state . These structures not only allow expansions and an increase in surface area of the vaginal epithelium, they provide the space necessary for the vaginal microbiota . The shape and structure of the rugae are supported maintained by the lamina propria of the vagina and the anterior and posterior rugae . </P> <P> 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 . </P>

Where do you find rugae in the reproductive system