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In the gynecoid pelvic outlet, as viewed in the transverse plane, the anterior-posterior dimension of the pelvic outlet (measured from the pubic symphysis to the tip of the coccyx) is about 10.5 cm in length. The oblique dimension is about 2 cm wider, measuring on average 12.5 cm in length. The latter dimension best accommodates the fetal shoulder width (biacromial diameter) during normal vaginal delivery.
