http://en.wikipedia.org/wiki/Pelvis
This leaves a slit for the anal and urogenital openings. Because of the width of the genital aperture, which is wider in females, a second closing mechanism is required. The urogenital diaphragm consists mainly of the deep transverse perineal which arises from the inferior ischial and pubic rami and extends to the urogential hiatus. The urogenital diaphragm is reinforced posteriorly by the superficial transverse perineal.
This leaves a slit for the anal and urogenital openings. Because of the width of the genital aperture, which is wider in females, a second closing mechanism is required. The urogenital diaphragm consists mainly of the deep transverse perineal which arises from the inferior ischial and pubic rami and extends to the urogential hiatus. The urogenital diaphragm is reinforced posteriorly by the superficial transverse perineal.
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