<prompt> The rectum is characterized by the presence ofTaenia coliHaustrationsPermanent transverse mucosal folds within lumenAppendicis epiploicae  <response>: The transverse folds of the rectum or Houston;s valves are semi-lunar transverse folds of the rectal wall that protrude into the rectum. These folds are about 12 mm. in width and are composed of the circular muscle coat of the rectum. They are usually three in numberTaenia coli, haustrations and appendices epiploicae are features of ColonRef: Vishram Singh; Volume II; 2nd edition; Page no: 282 