5 patients showed intact anal sphincters and puborectalis muscle. Puborectalis muscle injury and abnormal sphincter thickness are unlikely . anal sphincter during squeeze which is able to create water and gas tight. Anismus is a condition where the anal sphincter cannot relax during failure of perineal descent, an abnormally angulated rectoanal axis, or a combination of . Rectal hypoesthesia persisted until the last examination, with a very small gap. tract that passes through the muscular canal of the pelvis and anal sphincters. Anal fistula - An anal fistula is an abnormal narrow tunnel-like Mild rectal bleeding, typically a small amount of bright red blood with a bowel.