Relating to that part of the vagina derived from the urogenital sinus.
References in periodicals archive ?
The ovaries and lower third of the vagina have different embryological origins derived from germ cells that migrate from the primitive yolk sac and the sinovaginal bulb, respectively.
Paired sinovaginal bulb on posterior aspect of urogenital sinus fuse with lower end of mullerian duct to form vaginal plate.