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Encyclopedia > Jejunum
Diagram of the Human Intestine
Diagram of the Human Intestine

In anatomy of the digestive system, the jejunum is the central of the three divisions of the small intestine and lies between the duodenum and the ileum. In adult humans, it is usually between 2-8m (06' 07"-26' 03") long. The pH in the jejunum is usually between 7 and 8 (neutral or slightly alkaline). The jejunum and the ileum are suspended by mesentery which gives the bowel great mobility within the abdomen. Diagram of the Human Intestine. ... Diagram of the Human Intestine. ... Anatomical drawing of the human muscles from the Encyclopédie. ... For the Physics term GUT, please refer to Grand unification theory The gastrointestinal or digestive tract, also referred to as the GI tract or the alimentary canal or the gut, is the system of organs within multicellular animals which takes in food, digests it to extract energy and nutrients, and... Diagram showing the poop shoot In biology the small intestine is the part of the gastrointestinal tract between the stomach and the large intestine (colon). ... In anatomy of the digestive system, the duodenum is a hollow jointed tube that connects the stomach to the jejunum. ... In anatomy of the digestive system, the ileum (not to be confused with the ilium, a pelvic bone), is the final section of the small intestine. ... Binomial name Homo sapiens Linnaeus, 1758 Subspecies Homo sapiens idaltu (extinct) Homo sapiens sapiens Human beings define themselves in biological, social, and spiritual terms. ... pH is a measure of the activity of hydrogen ions (H+) in a solution and, therefore, its acidity or alkalinity. ... The common (Arrhenius) definition of a base is a chemical compound that either donates hydroxide ions or absorbs hydrogen ions when dissolved in water. ... In anatomy, the mesentery is a part of the peritoneum that connects an internal organ, such as the small intestine, to the abdominal wall. ... The human abdomen (from the Latin word meaning belly) is the part of the body between the pelvis and the thorax. ...


The inner surface of the jejunum, its mucous membrane, is covered in projections called villi, which increase the surface area of tissue available to absorb nutrients from the gut contents. It differs from the duodenum due to lack of Brunner's glands. It is also different from the ileum due to less goblet cells and generally lacks Peyer's patches. The mucous membranes (or mucosae; singular: mucosa) are linings of ectodermic origin, covered in epithelium, and are involved in absorption and secretion. ... Villi (singular: villus) are tiny, finger-like structures that protrude from the wall of the intestine to help absorb nutrients in the lumen. ... Brunners glands are submucosal glands located throughout the duodenum. ... Peyer’s patches are secondary lymphoid organs named after the 17th-century Swiss anatomist Hans Conrad Peyer. ...


Jejunum is derived from the adjective jejune, which means "fasting" or "hungry" in Early Modern English. Fasting is the act of willingly (and generally briefly) abstaining from all food and in some cases drink, or in other cases from certain types or groups of food (e. ... Early modern English is a name for the modern English language the way it was used between around 1485 and 1650. ...


External Links

Gastrolab.net:The Jejunum



Digestive system
Mouth - Pharynx - Crop - Esophagus - Stomach - Pancreas - Gallbladder - Liver - Small intestine (duodenum, jejunum, ileum) - Colon - Cecum - Rectum - Anus

  Results from FactBites:
 
Jejunum (214 words)
In anatomy of the digestive system, the jejunum is the central of the three divisions of the small intestine and lies between the duodenum and the ileum.
The pH in the jejunum is usually between 7 and 8 (neutral or slightly alkaline).
The inner surface of the jejunum, its mucous membrane, is covered in projections called villi, which increase the surface area of tissue available to absorb nutrients from the gut contents.
Tropical Medicine Central Resource (747 words)
The movement of barium through the duodenum and proximal jejunum may be so rapid (with to-and-fro motion and reverse peristalsis which can be dramatic at times) that multiple fluoroscopic spot films and a considerable quantity of barium are often necessary to adequately visualize mucosal detail in the involved areas.
Mucosal folds in the duodenum and jejunum are thickened and spiked and there is segmentation and fragmentation of the barium column due to the combination of irritability, mucosal edema, and increased secretions.
There is marked irritability of the duodenal C loop and proximal jejunum with distortion and thickening of the valvulae conniventes.
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