The normal, large puckered pouches in the walls of the large intestine are called haustra.
The haustras are bulges throughout almost the entire large intestine, generated by the contraction of the circular or radial muscle.
The haustras are not static structures, but change position as a result of contractions of the circular layer of smooth muscle.
That is, the presence of muscle bands causes slight constrictions to form that, in turn, delimit the pockets or sacculations that we call haustra.
Haustral contractions play an essential role in the motility of the large intestine, they are initiated due to the autonomous rhythmic activity of the smooth muscle cells of the colon.
These are similar to contractions that cause segmentation in the small intestine, only they occur much less frequently.
As a consequence of this contractile activity, the location of the haustra sacs changes, because the areas that contract and those that relax alternate.
Therefore, we can conclude that the normal, large puckered pouches in the walls of the large intestine are called haustra.
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