<prompt> Vaginal epithelium is a derivative ofMesoderm of urogenital sinusEndoderm of urogenital sinusMesoderm of genital ridgeEndoderm of genital ridge  <response>: The wall of the vagina from the lumen outwards consists firstly of the mucosa of non keratinized stratified squamous epithelium with an underlying lamina propria of connective tissue, secondly a layer of smooth muscle with bundles of circular fibers internal to longitudinal fibers, and thirdly an outer layer of connective tissue called the adventitia. ref - BDC 6e vol2 pg395 