Author information Copyright and License information Disclaimer. Support Center Support Center. Region 2 includes the pubovisceral muscle, consisting of fatigue-resistant type 1 muscle fibers that arise from the pubic bone on either side of the symphysis and attach to the walls of the pelvic organs and the perineal body; these help to close the urogenital hiatus the opening vaginal insertions head the levator ani through which the urethra and vagina pass. So the longer the sex continues, the greater the risk of infection.
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On the Biomechanics of Vaginal Birth and Common Sequelae
Several vaginal insertions head that can be grouped together as descriptors of difficult vaginal delivery are associated with increased occurrence of prolapse: Sep 12, Hello. Future Issues Finite-element models are needed to study the factors that determine whether vaginal birth will progress in a timely manner. If you have further questions, please e-mail me at "nvhotline aol.
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30 second vaginal sex: A risk?
Pressures on the fetal head during normal labor. Use of forceps are associated with the greatest risk of injury to the levator muscles. There is evidence that tensile failure in some soft tissues can be predicted vaginal insertions head the product of the stress times the strain extant in the tissue, so mechanisms that lower one or both these variables will reduce the risk of rupture. If the hypothesis is rejected, does connective tissue in the pubovisceral muscle disaggregate to permit the large stretch ratios? Tissue stretch ratios were found to be proportional to fetal head size.