The superior fascia of the urogenital diaphragm is continuous with the obturator fascia and stretches across the pubic arch.

If the obturator fascia be traced medially after leaving the obturator internus muscle, it will be found attached by some of its deeper or anterior fibers to the inner margin of the pubic arch, while its superficial or posterior fibers pass over this attachment to become continuous with the superior fascia of the urogenital diaphragm.

Some sources dispute that this structure exists.

[1] However, whether this layer is real or imagined, it still serves to describe a division of the contents of the perineum in many modern anatomy resources.

This article incorporates text in the public domain from page 429 of the 20th edition of Gray's Anatomy (1918)