<prompt> Which of the following statements about Valves of Houston is true -The middle valve corresponds to the middle convex fold to the RightThe upper valve corresponds to peritoneal reflectionsThe valves contain all three layers of muscle wallValves disappear after mobilization of Rectum.  <response>: Valves of Houston are lost after full mobilization of the Rectum.The middle valve is located on the Right Wall but corresponds to the middle convex fold to the left.The middle valve and not upper valve corresponds to the level of peritoneal reflection.Valves of Houston do not contain all three layers of the muscle wall. 