Circular fold

Circular fold (also known as plicae circulares) is a structure found within the small intestine, specifically in the jejunum and ileum. These folds are a significant part of the digestive system, playing a crucial role in nutrient absorption.

Anatomy

The circular fold is a series of ridges produced by the folding of the mucous membrane. The folds are approximately 1 cm in depth and are covered in intestinal villi, which are tiny, finger-like projections. The villi increase the surface area of the intestine, allowing for greater nutrient absorption.

Function

The primary function of the circular fold is to slow the passage of digested food, or chyme, through the intestines. This slowing allows more time for nutrients to be absorbed into the bloodstream. The folds also increase the surface area of the intestines, further enhancing absorption.

Clinical significance

Changes in the appearance or number of circular folds can indicate various gastrointestinal diseases. For example, a decrease in the number of folds may suggest celiac disease, while an increase could indicate Crohn's disease.

See also

• Digestive system
• Small intestine
• Jejunum
• Ileum
• Intestinal villi
• Chyme
• Gastrointestinal disease
• Celiac disease
• Crohn's disease