Final answer:
Haustra are unique pouch-like structures found in the large intestine, formed by muscle contractions of the tenia coli.
Step-by-step explanation:
Haustra are pouch-like structures associated with the large intestine. They are formed by tonic contractions of the tenia coli, which are three bands of smooth muscle making up the longitudinal muscle layer of the muscularized. These haustra give the colon its wrinkled appearance and are crucial for its function. It's important to note that haustra are unique to the large intestine and are not found in other parts of the digestive system such as the stomach, small intestine, or pancreas.