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
nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg) (同)vitellus

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
(卵の)黄身,卵黄

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/01/16 17:37:38」(JST)

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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.)
Latin	ductus vitellinus
Gray's	subject #10 54
Days	28
Precursor	midgut, yolk sac
MeSH	Vitelline+Duct

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 foetus.^[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).

Obliteration[edit]

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.

Afterbirth[edit]

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.

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

Mnemonic[edit]

A mnemonic used to recall details of a Meckel's diverticulum is as follows: "2 inches long, 2 feet from ileocecal valve, 2 times as common in males than females, 2% of population, 2% symptomatic, 2 types of ectopic tissue: gastric and pancreatic."

Additional images[edit]

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

References[edit]

^ ^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.

External links[edit]

yolk+stalk at eMedicine Dictionary

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. 小児における先天性鼻涙管閉塞（涙管閉鎖症）および涙嚢ヘルニア congenital nasolacrimal duct obstruction dacryostenosis and dacryocystocele
3. 総胆管損傷の修復 repair of common bile duct injuries
4. 甲状舌管嚢胞および異所性甲状腺 thyroglossal duct cysts and ectopic thyroid
5. 肝内胆管の消失および胆管消失症候群 hepatic ductopenia and vanishing bile duct syndrome

English Journal

Ovarian structure and oogenesis of catfish Pimelodella vittata (Lütken, 1874) (Siluriformes, Heptapteridae).

Sales NG, dos Santos SA, Arantes FP, Hojo RE, dos Santos JE.SourcePrograma de Pós-graduação em Zoologia de Vertebrados da PUC Minas, Av. Dom José Gaspar, 500, Coração Eucarístico, 30.535-610, Belo Horizonte, Minas Gerais, Brazil.
Anatomia, histologia, embryologia.Anat Histol Embryol.2013 Jun;42(3):213-9. doi: 10.1111/ahe.12004. Epub 2012 Sep 13.
The morphology of the ovaries and oogenesis of Pimelodella vittata were studied using anatomical and histological techniques to provide information of its reproductive biology. Eighty adult females were captured trimonthly during the period November 2005 to October 2006. The ovaries are paired, sacu
PMID 22971214

Taurine homeostasis requires de novo synthesis via cysteine sulfinic acid decarboxylase during zebrafish early embryogenesis.

Chang YC, Ding ST, Lee YH, Wang YC, Huang MF, Liu IH.SourceDepartment of Animal Science and Technology, National Taiwan University, Taipei 106, Taiwan.
Amino acids.Amino Acids.2013 Feb;44(2):615-29. doi: 10.1007/s00726-012-1386-8. Epub 2012 Aug 21.
Cysteine sulfinic acid decarboxylase (Csad) is the rate-limiting enzyme in the de novo biosynthesis of taurine. There are a number of physiological roles of taurine, such as bile salt synthesis, osmoregulation, lipid metabolism, and oxidative stress inhibition. To investigate the role of de novo syn
PMID 22907836

Early patterning in a chondrichthyan model, the small spotted dogfish: towards the gnathostome ancestral state.

Godard BG, Mazan S.SourceDevelopment and Evolution of Vertebrates, CNRS-UPMC-UMR 7150, Station Biologique, Roscoff, France.
Journal of anatomy.J Anat.2013 Jan;222(1):56-66. doi: 10.1111/j.1469-7580.2012.01552.x. Epub 2012 Aug 20.
In the past few years, the small spotted dogfish has become the primary model for analyses of early development in chondrichthyans. Its phylogenetic position makes it an ideal outgroup to reconstruct the ancestral gnathostome state by comparisons with established vertebrate model organisms. It is al
PMID 22905913

Japanese Journal

Partial characterization of cytoprotective mechanisms of lecithin against bile salt-induced bile duct damage

TSUBOI KAZUHIKO,TAZUMA SUSUMU,NISHIOKA TOMOJI,CHAYAMA KAZUAKI
Journal of gastroenterology 39(10), 955-960, 2004-10-01
NAID 10013798108

New advances in human embryology: morphofunctional relationship between the embryo and the yolk sac

PEREDA T. Jaime,MOTTA Pietro M.
Medical electron microscopy : official journal of the Clinical Electron Microscopy Society of Japan 32(2), 67-78, 1999
NAID 10007342200