I have been reading some articles recently about fissures and came across this picture of LIS:
http://dxline.info/img/new_ail/anal-sph ... tomy_2.jpg
As you can see, it shows a diagram of the ENTIRE thickness of the internal sphincter muscle being divided.
I thought the surgery involved only a small cut in the muscle instead of a full cut. Won't a full cut leave the patient incontinent? Is there such thing as a total LIS and a partial LIS? I searched and searched but have not found a definite answer to my question.