The section of the small intestine between the duodenum and the ileum.
[Middle English, from Medieval Latin iēiūnum (intestīnum), fasting (intestine) (so called because in dissection it was always found empty), neuter of Latin iēiūnus.]
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Results for jejunum
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World of the Body:
jejunum
The part of the small intestine next beyond the duodenum, and leading to the ileum. Its lining has an enormous surface area, by virtue of folds, projections (villi), and microvilli on the villi. Enzyme secretion and digestion, started in the stomach, continue here, and absorption of the products begins — of glucose and amino acids into blood capillaries and of fats into lymph capillaries (lacteals).
— Stuart Judge
See alimentary system.
Food and Nutrition:
jejunum
Part of the small intestine, between the duodenum and the ileum; see gastro-intestinal tract.
Dental Dictionary:
jejunum
n
The middle or intermediate of the three portions of the small intestine, connecting proximally with the duodenum and distally with the ileum. The jejunum has a slightly larger diameter, a deeper color, and a thicker wall than the ileum, and it contains heavy, circular folds that are absent in the lower part of the ileum.
Veterinary Dictionary:
jejunum
That part of the small intestine extending from the duodenum to the ileum.
Wikipedia:
jejunum
| Jejunum | |
|---|---|
 |
|
| Small intestine | |
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|
| Superior and inferior duodenal fossæ. | |
| Gray's | subject #248 1170 |
| Artery | intestinal arteries |
| Nerve | celiac ganglia, vagus [1] |
| Precursor | midgut |
| MeSH | Jejunum |
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 change from the duodenum to the jejunum is usually defined as the ligament of Treitz.
In adult humans, the small intestine is usually between 5.5-6m long, 2.5m of which is the jejunum.
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. It also contains muscles to help move the food along.
Internal structure
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. The villi in the jejunum are much longer than in the duodenum or ileum.
The jejunum contains very few Brunner's glands (found in the duodenum) or Peyer's patches (found in the ileum). Instead, it has many large circular folds in its submucosa called plicae circulares which increase the surface area for nutrient absorption.
Etymology
Jejunum is derived from the adjective jejune, which means "fasting" or "hungry" in Early Modern English. It was so called because this portion of the intestine was found "empty" following death [citation needed][Latin: jejunus, fasting; barren]
Additional images
 Duodenojejunal fossa. |
 Transmission electron microscope (TEM) of Human Jejunum |
 TEM of Mouse Jejunum x14000 |
References
External links
- Gastrolab.net:The Jejunum
- Peyer's patches
- SUNY Labs 37:11-0100 - "Abdominal Cavity: The Jejunum and the Ileum"
- SUNY Anatomy Image 7856
| Anatomy of torso, digestive system: Gastrointestinal tract | |
|---|---|
| Upper GI: to stomach | Mouth • Pharynx (nasopharynx, oropharynx, hypopharynx) • Esophagus • Crop |
| Upper GI: stomach | rugae - gastric pits - cardia/gland - fundus/gland - pylorus/gland - pyloric antrum - greater curvature - lesser curvature |
| Lower GI: intestines | Small intestine (duodenum, jejunum, ileum) • Vermiform appendix • Ileocecal valve - Large intestine: Cecum • Colon (ascending colon, hepatic flexure, transverse colon, splenic flexure, descending colon, sigmoid colon) |
| Lower GI: after intestines | Rectum (Houston valve, rectal ampulla, pectinate line) • Anal canal (anal valves, anal sinuses, anal columns) - Anus: Sphincter ani internus muscle • Sphincter ani externus muscle |
| Lower GI: continuous | GALT: Peyer's patches • M cells - intestinal villus • crypts of Lieberkühn • circular folds • taenia coli • haustra • epiploic appendix |
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
Translations:
Translations for:
Jejunum
Dansk (Danish)
n. - hungertarm, fastetarm
Nederlands (Dutch)
nuchtere darm
Français (French)
n. - (Anat) jéjunum
Deutsch (German)
n. - Leerdarm
Ελληνική (Greek)
n. - (ανατ.) νήστις
Português (Portuguese)
n. - jejuno (m) (Anat.)
Svenska (Swedish)
n. - övre delen av tunntarmen, jejunum
中文（简体） (Chinese (Simplified))
空肠
中文（繁體） (Chinese (Traditional))
n. - 空腸
العربيه (Arabic)
(الاسم) معي صائم, الصائم
עברית (Hebrew)
n. - המעי הריק
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Copyrights:
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 | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| World of the Body. The Oxford Companion to the Body. Copyright © 2001, 2003 by Oxford University Press. All rights reserved. Read more |
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| Food and Nutrition. A Dictionary of Food and Nutrition. Copyright © 1995, 2003, 2005 by A. E. Bender and D. A. Bender. All rights reserved. Read more |
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| Dental Dictionary. Mosby's Dental Dictionary. Copyright © 2004 by Elsevier, Inc. All rights reserved. Read more |
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| Veterinary Dictionary. The Veterinary Dictionary. Copyright © 2007 by Elsevier. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Jejunum". Read more |
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| Translations. Copyright © 2007, WizCom Technologies Ltd. All rights reserved. Read more |
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