The muscular tissue within the urogenital diaphragm has been removed to bring the thin superior fascia of the diaphragm into view. This fascia is intact on the right side of the dissection and has been cut through on the left where it is seen to be closely related to the inferior fascia of the pelvic diaphragm. It is also continuous with obturator fascia laterally on each side. The medial borders of the levator ani muscles are visible lateral to the prostate gland. Some of the fibers of these muscles converge posteriorly toward the central tendon of the perineum and the wall of the anal canal, whereas other fibers appear to spread out superficially at the sides of the anus. Although fibers of the small rectourethral muscle are not distinctly shown, these pass from the anterior wall of the rectum toward the urethra and are cut across in the central part of the dissection between anus and prostate (17).