My colorectal surgeon is the head of the colorectal department of the Cleveland Clinic. He told me that, even though there wasn't a reversal surgery for Crohn's patients, there might be sometime in the future so he left the sphincter muscles intact. Now, I THINK you can tell if you have them. Pretend that you were trying to hold a bowel movement inside (like it was before surgery). You should be able to feel those muscles squeeze and release. I'm not positive, but I think those are the sphincter muscles. I hope you still have yours, since medicine is coming up with new things every day!