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Transverse ruffles that ring the inner wall of the small intestine. The circular folds (plicae) are soft ridges of mucosa that protrude into the intestinal lumen. These folds are largest and closest together in the duodenum distal to the major duodenal papilla, they decrease in height and number through the distal jejunum, and they disappear in the distal ileum. See: circular plica
See also: fold