Wikipedia
Pubic arch
The pubic arch is part of the pelvis. It is formed by the convergence of the inferior rami of the ischium and pubis on either side, below the pubic symphysis. The angle at which they converge is known as the subpubic angle.
Usage examples of "pubic arch".
And of course the vaginal opening, the weak spot itself in the pelvic floor, had to be brought forward, brought under the pubic arch and so relieved from the line of direct pressure above.