plica circularis
anatomy
Also known as: plicae circulares, valve of Kerckring
Quick Summary
structures of the small intestine
The inner wall of the small intestine is covered by numerous folds of mucous membrane called plicae circulares. The surface of these folds contains tiny projections called villi and microvilli, which further increase the total area for absorption. Absorbed nutrients are moved into circulation by blood capillaries and lacteals, or lymph channels.
The plica circularis are permanent, crescent-shaped folds of mucous membrane found in the small intestine, primarily in the lower duodenum and jejunum. These folds, also known as valves of Kerckring, are crucial for increasing the absorptive surface area of the small intestine. They are largest in the upper jejunum and decrease in size towards the ileum. The plicae circulares, along with villi and microvilli, significantly enhance the small intestine's capacity to absorb nutrients from digested food.1
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