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Location of Plicae Circulares and Intestinal Villi in the Alimentary Tube Wall
Both plicae circulares (circular folds) and intestinal villi are projections of the tunica mucosa (mucosal layer).
Structural Details
- Plicae circulares: Permanent, transverse folds of mucosa and submucosa. Most prominent in the jejunum and ileum; absent in the stomach and most of the large intestine. Increase surface area ~3-fold.
- Intestinal villi: Microscopic, finger-like projections of mucosa (epithelium + lamina propria) covering the plicae and lining the lumen. Each villus contains a capillary network and lacteal. Increase surface area ~30-fold.
Layer Context
The alimentary wall from lumen outward: Mucosa (epithelium, lamina propria, muscularis mucosae) → Submucosa → Muscularis externa → Serosa/Adventitia. Plicae and villi are mucosal structures; they do not extend into the submucosa (though plicae contain submucosal core).
Clinical Relevance
Villous atrophy (e.g., celiac disease) drastically reduces absorptive surface. Plicae flatten in advanced small bowel disease.
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