NCIt related terms : Small Bowel Mucosa; small bowel mucosa of organ; mucosa of small intestine; small bowel organ mucosa; mucosa of organ of small bowel; small bowel mucous membrane; mucous membrane of small bowel; small intestine mucosa of organ; small intestine organ mucosa; tunica mucosa (intestinum tenue); small intestine mucosa; organ mucosa of small intestine; mucous membrane of small intestine; tunica mucosa intestini tenuis; mucosa of small bowel; mucosa of organ of small intestine; small intestine mucous membrane; organ mucosa of small bowel;
NCIt definition : Mucosa arranged into two fundamental structures - villi and crypts of Lieberkuhn.
Villi are projections into the lumen of the small intestine, covered with simple columnar
epithelium. Crypts of Lieberkuhn are moat-like invaginations of the epithelium around
the villi that extend through the lamina propria down to the muscularis mucosae. Lymphocytes
often invade the epithelium or form solitary lymphoid nodules in the lamina propria.
Lymph nodules may form longitudinal aggregations of 30-50 nodules in the lamina propria
of the ileum. These large aggregations are called Peyer's patches. The muscularis
mucosae has two layers and extends into the intestinal villi, where the smooth muscle
cells form a longitudinal bundle in the centre of the villi. The small intestinal
mucosa secretes gastrin, somatostatin, cholecystokinin and secretin.;
Alternative definition : CDISC: The mucosal membranes that line the inner surface of the small intestine.; UBERON: A mucosa that is part of a small intestine.;