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- Gastrointestinal_wall abstract "The gastrointestinal wall is a specialised series of layers that surrounds the gastrointestinal tract. The general structure involves four layers, the mucosa, submucosa, muscularis externa, and adventitia or serosa, that may differ slightly in form and function according to the part of the gastrointestinal tract they belong to.The gastrointestinal wall is a structure that is relatively consistent throughout the intestines and other parts of the gastrointestinal tract. The gastrointestinal wall is conventionally regarded as having four layers: a mucosa, which is exposed to the contents of the tract, a submucosa underneath the mucosa; and two outer layers, consisting of the an external muscular layer, and a serosa.The epithelium, the most exposed part of the mucosa, is a glandular epithelium with many goblet cells. Goblet cells secrete mucus, which lubricates the passage of food along and protects it from digestive enzymes. In the small intestine, villi are folds of the mucosa that increase the surface area of the intestine. The villi contain a lacteal, a vessel connected to the lymph system that aids in the removal of lipids and tissue fluids. Microvilli are present on the epithelium of a villus and further increase the surface area over which absorption can take place. Pocket-like invaginations into the underlying tissue are termed Crypts of Lieberkühn. In the large intestines, villi are absent and a flat surface with thousands of crypts is observed. Underlying the epithelium is the lamina propria, which contains myofibroblasts, blood vessels, nerves, and several different immune cells, and the muscularis mucosa which is a layer of smooth muscle that aids in the action of continued peristalsis and catastalsis along the gut. The submucosa contains nerves (e.g. Meissner's plexus), blood vessels and elastic fibre with collagen that stretches with increased capacity but maintains the shape of the intestine.Surrounding this is the muscularis externa, which comprises longitudinal and circular smooth muscle that again helps with continued peristalsis and the movement of digested material out of and along the gut. In between the two layers of muscle lies Auerbach's plexus.Lastly, there is the serosa which is made up of loose connective tissue and coated in mucus so as to prevent any friction damage from the intestine rubbing against other tissue. Holding all this in place are the mesenteries which suspend the intestine in the abdominal cavity and stop it being disturbed when a person is physically active.".
- Gastrointestinal_wall thumbnail Gut_wall.svg?width=300.
- Gastrointestinal_wall wikiPageID "41543593".
- Gastrointestinal_wall wikiPageRevisionID "598338180".
- Gastrointestinal_wall subject Category:Digestive_system.
- Gastrointestinal_wall comment "The gastrointestinal wall is a specialised series of layers that surrounds the gastrointestinal tract. The general structure involves four layers, the mucosa, submucosa, muscularis externa, and adventitia or serosa, that may differ slightly in form and function according to the part of the gastrointestinal tract they belong to.The gastrointestinal wall is a structure that is relatively consistent throughout the intestines and other parts of the gastrointestinal tract.".
- Gastrointestinal_wall label "Gastrointestinal wall".
- Gastrointestinal_wall sameAs m.0zwrqx1.
- Gastrointestinal_wall sameAs Q17154506.
- Gastrointestinal_wall sameAs Q17154506.
- Gastrointestinal_wall wasDerivedFrom Gastrointestinal_wall?oldid=598338180.
- Gastrointestinal_wall depiction Gut_wall.svg.
- Gastrointestinal_wall isPrimaryTopicOf Gastrointestinal_wall.