urogenital diaphragm n a double layer of pelvic fascia with its included muscle that is situated between the ischial and pubic rami, supports the prostate in the male, is traversed by the vagina in the female, gives passage to the membranous part of the urethra, and encloses the sphincter urethrae
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traditional but no longer valid concept that superior and inferior fascial layers enclose the sphincter urethrae and deep transverse perineal muscles and together form a musculomembranous sheet that extends between the ischiopubic rami. Called also accessory or secondary d. and urogenital triangle or trigone. See also membrana perinei.Medical dictionary. 2011.