WordNet

a continuous tube formed by a row of elongated cells lacking intervening end walls
an enclosed conduit for a fluid
a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance; "the tear duct was obstructed"; "the alimentary canal"; "poison is released through a channel in the snakes fangs" (同)epithelial duct, canal, channel

PrepTutorEJDIC

送水管;(建物・船などの)通気管;(地下ケーブルなどの)ダクト / (体液を運ぶ)導管,(植物が水・空気を運ぶ)導管

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/06/07 19:39:21」(JST)

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In the human embryo, the vitelline duct, also known as the omphalomesenteric duct, is a long narrow tube that joins the yolk sac to the midgut lumen of the developing fetus.^[1] It appears at the end of the fourth week, when the yolk sac presents the appearance of a small pear-shaped vesicle (the umbilical vesicle).

Function

Obliteration

Generally, the duct fully obliterates (narrows and disappears) during the 5–6th week of fertilization age (9th week of gestational age), but a failure of the duct to close is termed a vitelline fistula. This results in discharge of meconium from the umbilicus.^[1] About two percent of fetuses exhibit a type of vitelline fistula characterized by persistence of the proximal part of the vitelline duct as a diverticulum protruding from the small intestine, Meckel's diverticulum, which is situated about two feet above the ileocecal junction and may be attached by a fibrous cord to the abdominal wall at the umbilicus.

Persistence

The vesicle can be seen in the afterbirth as a small, somewhat oval-shaped body, the diameter of which varies from 1 mm to 5 mm. It is situated between the amnion and the chorion and may lie on or at a varying distance from the placenta.

Clinical significance

Meckel's Diverticulum

Sometimes a narrowing of the lumen of the ileum is seen opposite the site of attachment of the duct. On this site of attachment, sometimes a pathological Meckel's diverticulum may be present.

A mnemonic used to recall details of a Meckel's diverticulum is as follows: "2 inches long, within 2 feet of ileocecal valve, 2 times as common in males than females, 2% of population, 2% symptomatic, 2 types of ectopic tissue: gastric and pancreatic". Note that the true number of symptomatic diverticulae is 4%.^[2] Other references indicate that a Meckel diverticulum may be seen within 2 meters of the ileocecal valve.^[3]

Additional images

Front view of two successive stages in the development of the digestive tube.

References

^ ^a ^b Le, Tao; Bhushan, Vikas; Vasan, Neil (2010). First Aid for the USMLE Step 1: 2010 20th Anniversary Edition. USA: The McGraw-Hill Companies, Inc. p. 122. ISBN 978-0-07-163340-6.
^ Robbins and Cotran, Pathologic Basis of Disease, 8th ed., p. 766
^ Brant and Helms, Fundamentals of Diagnostic Radiology, 4th ed., p. 778

UpToDate Contents

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1. 臍のケアおよび臍の異常のマネージメント care of the umbilicus and management of umbilical disorders
2. 胆嚢癌の外科的マネージメント surgical management of gallbladder cancer
3. 総胆管損傷の修復 repair of common bile duct injuries
4. 肝内胆管の消失および胆管消失症候群 hepatic ductopenia and vanishing bile duct syndrome
5. 成人における外傷による十二指腸および膵臓損傷のマネージメント management of duodenal and pancreatic trauma in adults

English Journal

NEW GENUS AND SPECIES OF FISH BLOOD FLUKE (DIGENEA: APOROCOTYLIDAE ODHNER, 1912) FROM STOPLIGHT PARROTFISH, SPARISOMA VIRIDE (BONNATERRE, 1788), (LABRIDAE: SCARINAE) IN THE CARIBBEAN SEA.

Bullard SA, Williams EH, Bunkley-Williams L.Sourcea Auburn University, Assistant Professor, Fisheries, Auburn University.
The Journal of parasitology.J Parasitol.2012 Jun 11. [Epub ahead of print]
Abstract ABSTRACT: Primisanguis caribbeanensis n. gen., n. sp. (Digenea: Aporocotylidae) infects the stoplight parrotfish, Sparisoma viride (Bonnaterre, 1788), (Labridae: Scarinae) in the Caribbean Sea off La Parguera (N17°58'26"; W67°02'47"), Puerto Rico. It is most easily distinguished from ot
PMID 22686574

A new aporocotylid (Digenea) species from blood vascular system of gag grouper, Mycteroperca microlepis (Perciformes: Serranidae), off Alabama, with an emendation of Pearsonellum Overstreet & Køie, 1989.

Bullard SA.SourceAquatic Parasitology Laboratory, Department of Fisheries and Allied Aquacultures, College of Agriculture, Auburn University, 203 Swingle Hall, Auburn, Alabama 36849, USA. ash.bullard@auburn.edu
The Journal of parasitology.J Parasitol.2012 Apr;98(2):323-7. Epub 2011 Oct 21.
Pearsonellum lemusi n. sp. (Digenea: Aporocotylidae) infects the blood vascular system of the gag grouper, Mycteroperca microlepis (Perciformes: Serranidae), in the north central Gulf of Mexico, approximately 80 km south of Dauphin Island, Alabama (29°34'09″N, 88°22'16″W). The new species can
PMID 22017521

Japanese Journal

The umbilical mass : a rare neonatal anomaly

CARLISLE Erica M.,MEZHIR James J.,GLYNN Loretto,LIU Donald C.,STATTER Mindy B.
Pediatric surgery international 23(8), 821-824, 2007-08-01
NAID 10027858171

症例報告尿膜管遺残による臍炎に臍腸管遺残と思われる索状物が併存した1手術例

宇都宮俊介,大畑誠二,菅野幹雄 [他]
四国医学雑誌 62(1・2), 55-59, 2006-04-25
… Postoperativepathology revealed that the both bands was made of smooth muscle tissue, and wasdiagnosed as viterine duct and urachal remnant. …
NAID 40007301379

A CASE OF UMBILICAL PILONIDAL SINUS

山中秀高,小野要,佐藤達郎
日本臨床外科学会雑誌 66(3), 758-761, 2005
… No fistula suggesting urachal remnants nor vitelline duct remnants was detected. … Abdominal US and CT were useful to differentiate the disease from urachal and vitelline duct remnants, but difficult from omphalitis, so that the ailing time was prone to be prolonged. …
NAID 130003604411

Related Pictures

★リンクテーブル★

リンク元	「原始臍輪」「卵黄腸管」
関連記事	「duct」「vitelline」

「原始臍輪」

Vitelline duct
	Fetus of about eight weeks, enclosed in the amnion. (Vitelline duct labeled at lower right.)
	Sketches in profile of two stages in the development of the human digestive tube. (Vitelline duct labeled on bottom image.)
Details
Latin	ductus vitellinus
Days	28
Precursor	midgut, yolk sac
Identifiers
Gray's	p.54
MeSH	A16.254.891
	Anatomical terminology