Meaning of c¿pula vaginal by Felipe Lorenzo del Río

c vaginal pula is incorrectly written and it should be written as "vaginal dome" being its meaning:?
The vagina is a tube extending fibromuscular of variable width and length that connects the vulva ( outer zone of the 41 female sexual apparatus; with the cervix ( point of union of the uterus with the deepest area of the vagina ). The vagina of the female can have 8 to 11 cm in length. The vaginal dome is its upper extremity or deeper is constituted by an annular groove that surrounds the entrance to the cervix into the vagina. To this Groove doctors he is called fornix ( arc in latin ) distinguishing 4 zones: anterior, posterior fornix and two sides, right and left. Intercourse the penis touches fornix previous vaginal dome in the missionary position, while in the position of the dog he touches the posterior fornix.