They are two broad folds of membranous and adipose substance, forming the portals to the Vulva, or entrance to the Vagina.
Here the shoulder is protruded from the Vulva, the back being nearly folded, and the knees turned up against the face.
The Vulva begins to dilate, the lips separate wider and wider, and part of the child's head becomes visible.
In some instances the veins around the Vulva become much enlarged, and resemble tumors, and sometimes even impede delivery.
Vulva, vul′va, n. the orifice of the external organs of generation of the female.