Anal fissure: The physiology of a chronic fissure is this: the internal sphincter muscle is an involuntary sphincter. It relaxes when the rectum is distended secondary to a bowel movement. Once the stool comes down and hits the fissure..The base of the fissure is the internal sphincter muscle. It spasms , funnelling the anal canal putting pressure anteriorly and posteriorly. The result..Pain and chronic fissure.
Answered 1/18/2018
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