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They also used landmarks on the pelvic fragments to compare the pelvis to those of modern humans, and to predict the size and shape of the missing pieces, such as the sacrum and dimensions of the pelvic outlet.
The perineum is the external aspect of the pelvic outlet from the levator ani muscles through to the perineal skin, external genitalia and openings of the genitourinary and gastrointestinal tracts.
The perineal membrane is a single layer of fibromuscular tissue that spans the anterior triangle of the pelvic outlet.