Pelvic fascia
The layer covering the upper surface of the pelvic diaphragm follows, above, the line of origin of the Levator ani and is therefore somewhat variable.It can then be traced laterally across the back of the superior ramus of the pubis for a distance of about 1.25 cm, when it reaches the obturator fascia.Tendinous fibers of origin of the muscle are therefore often found extending up toward, and in some cases reaching, the pelvic brim, and on these the fascia is carried.The diaphragmatic part of the pelvic fascia covers both surfaces of the levatores ani.This article incorporates text in the public domain from page 420 of the 20th edition of Gray's Anatomy (1918)