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

Pubic arch

The eminences of the lower circumference of the true pelvis are separated by three notches: one in front, the pubic arch, formed by the convergence of the inferior rami of the ischium and pubis on either side. The angle at which they converge is known as the subpubic angle.-External links:* *...

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If the obturator fascia be traced medially after leaving the Obturator internus muscle

Obturator internus muscle

The obturator internus muscle originates on the medial surface of the obturator membrane, the ischium near the membrane, and the rim of the pubis.It exits the pelvic cavity through the lesser sciatic foramen....

, it will be found attached by some of its deeper or anterior fibers to the inner margin of the pubic arch

Pubic arch

The eminences of the lower circumference of the true pelvis are separated by three notches: one in front, the pubic arch, formed by the convergence of the inferior rami of the ischium and pubis on either side. The angle at which they converge is known as the subpubic angle.-External links:* *...

, while its superficial or posterior fibers pass over this attachment to become continuous with the superior fascia of the urogenital diaphragm

Urogenital diaphragm

Older texts have asserted the existence of an urogenital diaphragm, also called the triangular ligament, which was described as a layer of the pelvis that separates the deep perineal sac from the upper pelvis, lying between the inferior fascia of the urogenital diaphragm and superior fascia of the...

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Behind, this layer of the fascia is continuous with the inferior fascia and with the fascia of Colles

Fascia of Colles

The deep layer of superficial fascia is thin, aponeurotic in structure, and of considerable strength, serving to bind down the muscles of the root of the penis.It separates the skin from the superficial perineal pouch.-Relations:...

; in front it is continuous with the fascial sheath of the prostate

Prostate

The prostate is a compound tubuloalveolar exocrine gland of the male reproductive system in most mammals....

, and is fused with the inferior fascia to form the transverse ligament of the pelvis.

Controversy

Some sources dispute that this structure exists. 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.