Jejunum

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Overview

Jejunum
Small intestine
Superior and inferior duodenal fossæ.
Gray's	subject #248 1170
Artery	intestinal arteries
Nerve	celiac ganglia, vagus [1]
Precursor	midgut
MeSH	Jejunum

WikiDoc Resources for Jejunum
Articles
Most recent articles on Jejunum Most cited articles on Jejunum Review articles on Jejunum Articles on Jejunum in N Eng J Med, Lancet, BMJ
Media
Powerpoint slides on Jejunum Images of Jejunum Photos of Jejunum Podcasts & MP3s on Jejunum Videos on Jejunum
Evidence Based Medicine
Cochrane Collaboration on Jejunum Bandolier on Jejunum TRIP on Jejunum
Clinical Trials
Ongoing Trials on Jejunum at Clinical Trials.gov Trial results on Jejunum Clinical Trials on Jejunum at Google
Guidelines / Policies / Govt
US National Guidelines Clearinghouse on Jejunum NICE Guidance on Jejunum NHS PRODIGY Guidance FDA on Jejunum CDC on Jejunum
Books
Books on Jejunum
News
Jejunum in the news Be alerted to news on Jejunum News trends on Jejunum
Commentary
Blogs on Jejunum
Definitions
Definitions of Jejunum
Patient Resources / Community
Patient resources on Jejunum Discussion groups on Jejunum Patient Handouts on Jejunum Directions to Hospitals Treating Jejunum Risk calculators and risk factors for Jejunum
Healthcare Provider Resources
Symptoms of Jejunum Causes & Risk Factors for Jejunum Diagnostic studies for Jejunum Treatment of Jejunum
Continuing Medical Education (CME)
CME Programs on Jejunum
International
Jejunum en Espanol Jejunum en Francais
Business
Jejunum in the Marketplace Patents on Jejunum
Experimental / Informatics
List of terms related to 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 [Latin: jejunus, fasting; barren]

Additional images

Duodenojejunal fossa.

Transmission electron microscope (TEM) of Human Jejunum

TEM of Mouse Jejunum x14000

References

1. ↑ Physiology at MCG 6/6ch2/s6ch2_30

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

v • d • e WikiDoc Research Resources for Jejunum
Articles on Jejunum	Most recent articles on Jejunum • Most cited articles on Jejunum • Review articles on Jejunum • Articles on Jejunum in N Eng J Med, Lancet, BMJ
Media (Slides, Video, Images, MP3) on Jejunum	Powerpoint slides on Jejunum • Images of Jejunum • Photos of Jejunum • Podcasts & MP3s on Jejunum • Videos on Jejunum
Evidence Based Medicine Regarding Jejunum	Cochrane Collaboration on Jejunum • Bandolier on Jejunum • TRIP on Jejunum
Cost Effectiveness of Jejunum	Cost Effectiveness of Jejunum
Clinical Trials Involving Jejunum	Ongoing Trials on Jejunum at Clinical Trials.gov • Trial results on Jejunum • Clinical Trials on Jejunum at Google
Guidelines / Policies / Government Resources (FDA/CDC) Regarding Jejunum	US National Guidelines Clearinghouse on Jejunum • NICE Guidance on Jejunum • NHS PRODIGY Guidance • FDA on Jejunum • CDC on Jejunum
Textbook Information on Jejunum	Books and Textbook Information on Jejunum
Pharmacology Resources on Jejunum	Dosing of Jejunum • Drug interactions with Jejunum • Side effects of Jejunum • Allergic reactions to Jejunum • Overdose information on Jejunum • Carcinogenicity information on Jejunum • Jejunum in pregnancy • Pharmacokinetics of Jejunum •
Genetics, Pharmacogenomics, and Proteinomics of Jejunum	Genetics of Jejunum • Pharmacogenomics of Jejunum • Proteomics of Jejunum
Newstories on Jejunum	Jejunum in the news • Be alerted to news on Jejunum • News trends on Jejunum
Commentary on Jejunum	Blogs on Jejunum
Patient Resources on Jejunum	Patient resources on Jejunum • Discussion groups on Jejunum • Patient Handouts on Jejunum • Directions to Hospitals Treating Jejunum • Risk calculators and risk factors for Jejunum
Healthcare Provider Resources on Jejunum	Symptoms of Jejunum • Causes & Risk Factors for Jejunum • Diagnostic studies for Jejunum • Treatment of Jejunum
Continuing Medical Education (CME) Programs on Jejunum	CME Programs on Jejunum
International Resources on Jejunum	Jejunum en Espanol • Jejunum en Francais
Business Resources on Jejunum	Jejunum in the Marketplace • Patents on Jejunum
Informatics Resources on Jejunum	List of terms related to Jejunum

v • d • e 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 - pyloric canal - greater curvature - lesser curvature - angular incisure
Lower GI: intestines	Small intestine: Duodenum (Suspensory muscle, Major duodenal papilla, Minor duodenal papilla) • Duodenojejunal flexure • Jejunum • Ileum • continuous (intestinal villus, crypts of Lieberkühn, circular folds) Junction: Vermiform appendix • Ileocecal valve Large intestine: Cecum • Colon (ascending colon, hepatic flexure, transverse colon, splenic flexure, descending colon, sigmoid colon) • continuous (taenia coli, haustra, epiploic appendix)
Lower GI: termination	Rectum: Houston valve • rectal ampulla • pectinate line Anal canal: anal valves • anal sinuses • anal columns • Hilton's white line Anus: Sphincter ani internus muscle • Sphincter ani externus muscle
Lower GI: lymph	GALT: Peyer's patches (M cells)

de:Jejunumeo:Jejuno

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