sacculation

The haustra (singular haustrum) of the colon are the small pouches caused by sacculation (sac formation), which give the colon its segmented appearance.

The structure and function of the large intestine varies greatly among mammals, with variability concerning mostly the extent of the sacculation and the size of the caecum.

Bettong digestive systems are characterized by a very large sacciform fore stomach, a tubiform fore stomach with limited sacculation, and a small hind stomach.

Also, the uterus may develop a uterine sacculation, that is a part of its back wall softens like an aneurysm and allows expansion of the fetus into the abdomen with a risk of uterine rupture.