I found this online to help explain it a lot easier than what I had in mind...lol
Labor is a very complicated cooperation of many factors--fetal, maternal, hormonal, and mechanical. One thing alone won't necessarily push a woman into labor, including "stripping membranes." What your doctor is talking about is essentially just an aggressive pelvic exam in which he will feel around just inside your cervix where the membranes ("bag of water") are attached to its rim. By running an examining finger around the inside of your cervix, he can separate the amniotic sac from where it's stuck there. Theoretically, this will allow the bridging molecules that stick the membranes to the inside rim of the cervix to break--all at a molecular level, mind you--and so be released and then converted into prostaglandins, which are powerful stimulants of labor.
at 10:55 PM on Sep. 30, 2009