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Dr. Megan Routzong and her colleagues acquired pelvic skeletal muscle samples from female human donors for ex vivo passive mechanical testing and compared the mechanical behavior of the levator ani muscles (the main component of the pelvic floor muscles) to the lesser studied superficial perineal muscles. Due to observed differences, especially in transvers stresses/strains, they concluded that levator ani mechanical testing data should not be used to approximate the material properties of superficial perineal muscles, particularly with regards to computational simulations of the female pelvic floor.