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）』「2014/02/03 13:14:23」(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	p.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. メッケル憩室 meckels diverticulum
3. 全身性エリテマトーデスの神経精神症状に対する診断的アプローチ diagnostic approach to lower gastrointestinal bleeding in children
4. 妊娠中の甲状腺機能亢進症：治療 hyperthyroidism during pregnancy treatment
5. Acute appendicitis in adults: Clinical manifestations and differential diagnosis

English Journal

The role of the gastrointestinal epithelium as a possible pathway for the transfer of nutrients to the embryo's circulation.

Pereda J1, Sulz L1, Monge JI1,2.
Microscopy research and technique.Microsc Res Tech.2015 Jun;78(6):500-7. doi: 10.1002/jemt.22501. Epub 2015 Mar 24.
The endodermal cells of the human yolk sac (YS) produce non-nucleated erythrocytes (NNEs) and numerous serum proteins that are transiently storage within the YS cavity. After their transfer via the vitelline duct to the embryo gastrointestinal lumen, the nutrients' final fate is unknown. With the ai
PMID 25808242

Imaging of omphalomesenteric duct remnants and related pathologies in children.

Bagade S1, Khanna G2.
Current problems in diagnostic radiology.Curr Probl Diagn Radiol.2015 May-Jun;44(3):246-55. doi: 10.1067/j.cpradiol.2014.12.003. Epub 2015 Jan 3.
The omphalomesenteric duct (OMD) or the vitelline duct (VD) is the embryologic communication between the yolk sac and the primitive midgut. OMD or VD anomalies are a group of defects resulting from failure of involution of the OMD. Meckel diverticulum is the most common anomaly that results from fai
PMID 25823549

Immunolocalization of the 29 kDa Schistosoma haematobium species-specific antigen: a potential diagnostic marker for urinary schistosomiasis.

Markakpo US1, Armah GE2, Fobil JN3, Asmah RH4, Anim-Baidoo I5, Dodoo AK6, Madjitey P7, Essuman EE8, Kojima S9, Bosompem KM10.
BMC infectious diseases.BMC Infect Dis.2015 Apr 26;15:198. doi: 10.1186/s12879-015-0931-y.
BACKGROUND: The 29 kDa Schistosoma haematobium species-specific antigen (ShSSA) is of remarkable interest in the diagnosis of urinary schistosomiasis although it had not been fully characterized.METHOD: To determine the biological importance of ShSSA in S. haematobium and pathogenesis of the disease
PMID 25927905

Japanese Journal

Type D congenital esophageal atresia associated with omphalomesenteric duct remnant

TAKEYAMA Masahiro,KANEHIRO Hiromichi,NISHIKUBO Toshiya,IZAKI Kazufumi,ARAI Ikuyo,KAMAMOTO Tomoyuki,FUJITA Yuri,SHIBATA Mari,UCHIDA Yoshiko,TAKAHASHI Yukihiro
Pediatrics international : official journal of the Japan Pediatric Society 52(4), 679, 2010-08-01
NAID 10028183921

Symptomatic omphalomesenteric duct remnants in children

DURAKBASA Cigdem Ulukaya,OKUR Hamit,MUTUS Huseyin Murat,BAS Ahmet,OZEN Mehmet Ali,SEHIRALTI Varol,TOSYALI Ahmet Nadir,ZEMHERI Itir Ebru
Pediatrics international : official journal of the Japan Pediatric Society 52(3), 480-484, 2010-06-01
NAID 10028182996

臍腸管遺残の腸管側端が盲腸であった臍帯内ヘルニアの1例

坂井幸子,仁科孝子,村越孝次 [他],新井真理,近藤昌敏,岡崎薫,水口國雄
日本小児外科学会雑誌 46(2), 264-268, 2010-04-20
臍腸管遺残部分が盲腸や虫垂であることは極めてまれであり,若干の文献的考察を加えて報告する.症例は日齢0の男児.在胎35週6日,胎児心音低下のため緊急帝王切開にて出生.体重1,580g,Apgar score 7/8点.臍帯内ヘルニアを認め当院搬送入院,臍帯内の脱出腸管がヘルニア嚢の一部に開口し,便が体外へ漏出していたため,緊急手術を施行.ヘルニア嚢を切開すると嚢内に脱出していた腸管が腸管様索状物に …
NAID 110007593925