Haustra are small, pouch-like structures found in the large intestine, specifically in the colon. They are formed by the contraction of the muscle layers in the intestinal wall, creating bulges that help segment the colon. This segmentation aids in the absorption of water and electrolytes from the waste material as it moves through the digestive system. These pouches play a crucial role in the process of digestion by allowing for more efficient mixing and movement of contents. The presence of haustra contributes to the characteristic appearance of the colon, which is often described as having a series of bulging segments, enhancing the overall function of the gastrointestinal tract.