Arteries of cecum and vermiform process.
The haustra (singular haustrum) of the colon are the small pouches caused by sacculation, which give the colon its segmented appearance. The taenia coli run the length of the large intestine. Because the taenia coli are shorter than the intestine, the colon becomes sacculated between the taenia coli, forming the haustra.
Haustral contractions are slow segmenting, peristaltic movements that occur every 25 minutes. One haustrum distends as it fills with chyme, which stimulates muscles to contract, pushing the contents to the next haustrum.
There is a wider distance between haustra than between the circular folds of the small intestine, and the haustra don't reach around the entire circumference of the intestine, in contrast to circular folds of the small intestine that do. These differences can assist in distinguishing the small intestine from the colon on an abdominal x-ray.