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Fig. 2C. —Normal anatomy of urethra and its supporting structures in 34-year-old continent woman. Axial MR image obtained at approximately 50th percentile of urethra shows normal pubourethral ligament connecting urethra to arcus tendineus fasciae pelvis and caudal portion of periurethral ligament. Thickness of puborectalis sling, measured in 4- and 8- o'clock directions from urethra, is 4.2 mm in right limb and 3.8 mm in left limb. Therefore, mean thickness of puborectalis muscle is 4.0 mm and degree of asymmetry is 1.1.