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a natural opening or perforation through a bone or a membranous structure (同)hiatus
marine microorganism having a calcareous shell with openings where pseudopods protrude (同)foraminifer

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(骨・植物などの)孔(こう),開口

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/05/31 10:22:37」(JST)

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In human anatomy, the omental foramen (epiploic foramen, foramen of Winslow after the anatomist Jacob B. Winslow, or uncommonly aditus; Latin: Foramen epiploicum), is the passage of communication, or foramen, between the greater sac (general cavity (of the abdomen)), and the lesser sac.

Borders

It has the following borders:

anterior: the free border of the lesser omentum, known as the hepatoduodenal ligament. This has two layers and within these layers are the common bile duct, hepatic artery, and hepatic portal vein. A useful mnemonic to remember these is DAVE: Duct, Artery, Vein, Epiploic foramen.
posterior: the peritoneum covering the inferior vena cava
superior: the peritoneum covering the caudate lobe of the liver
inferior: the peritoneum covering the commencement of the duodenum and the hepatic artery, the latter passing forward below the foramen before ascending between the two layers of the lesser omentum.
left lateral: gastrosplenic ligament and splenorenal ligament

As the portal vein is the most posterior structure in the hepatoduodenal ligament, and the inferior vena cava lies under the posterior wall, the epiploic foramen can be remembered as lying between the two great veins of the abdomen.

Additional images

Vertical disposition of the peritoneum. Main cavity, red; omental bursa, blue. (Bristle in omental foramen labeled at upper left.) |
Diagram to show the lines along which the peritoneum leaves the wall of the abdomen to invest the viscera.
Epiploic foramen

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links

foramen.aspx "Omental foramen". Medcyclopaedia. GE. Archived from foramen.aspx the original on 2012-02-05.
Anatomy photo:37:08-0100 at the SUNY Downstate Medical Center – "Abdominal Cavity: The Omental Foramen"
Anatomy image:7826 at the SUNY Downstate Medical Center
Anatomy image:7831 at the SUNY Downstate Medical Center
Anatomy image:7875 at the SUNY Downstate Medical Center
peritoneum at The Anatomy Lesson by Wesley Norman (Georgetown University)
abdominalcavity at The Anatomy Lesson by Wesley Norman (Georgetown University) (xsectthrulesseromentum)

UpToDate Contents

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1. 卵円孔開存 patent foramen ovale
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5. 成人における脳卒中予防のための心房中隔異常（PFO、ASDおよびASA）の治療 treatment of atrial septal abnormalities pfo asd and asa for prevention of stroke in adults

English Journal

Pringle's Maneuver With a Releasable Insulok Band.

Chang YC1.
Surgical innovation.Surg Innov.2015 Oct;22(5):484-7. doi: 10.1177/1553350614545241.
BACKGROUND: Currently, there are many conventional instruments being applied to perform hepatic inflow control, the Pringle's maneuver, distal to the hepatic hilum during hepatic resections. We wondered if a commonly used Insulok band can be added.MATERIALS AND METHODS: Insulok band is a plastic tyi
PMID 26388163

Visualization of the omental bursa and its spatial relationships to left subphrenic extraperitoneal spaces by the second Chinese Visible Human model.

Xu H1, Xiang K, He M, Tian F, Wu Y.
Surgical and radiologic anatomy : SRA.Surg Radiol Anat.2015 Jul;37(5):473-81. doi: 10.1007/s00276-015-1462-3. Epub 2015 Mar 28.
PURPOSE: In order to overcome the obstacle that detailed spatial relationships of the omental bursa to its related spaces cannot be displayed clearly by thick-slice sectional anatomical imaging and computed tomography, we designed a new approach to three-dimensional (3D) visualization of the omental
PMID 25820977

A topographic anatomical study of the equine epiploic foramen and comparison with laparoscopic visualisation.

van Bergen T1, Doom M, van den Broeck W, Wiemer P, Clegg PD, Cornillie P, Martens A.
Equine veterinary journal.Equine Vet J.2015 May;47(3):313-8. doi: 10.1111/evj.12282. Epub 2014 Jun 25.
REASONS FOR PERFORMING STUDY: There are no previous studies correlating the anatomy of the equine epiploic foramen and its defining structures with laparoscopic images.OBJECTIVES: The purpose of this study was to describe the precise anatomy of the epiploic foramen and omental vestibule, to quantify
PMID 24750299

Japanese Journal

Herniation Through Both Winslow's Foramen and a Lesser Omental Defect : Report of a Case

SAIDA YOSHIHISA,NAGAO JIRO,TAKASE MAKOTO,NOTO YASUMITSU,KUSACHI SHINYA,KAJIWARA YOSHIHIRO,SUMIYAMA YOSHINOBU
Surgery today : the Japanese journal of surgery 30(6), 544-547, 2000-06-01
NAID 10017514457

Omental herniation through the foramen of Morgagni. Diagnosis with chest computed tomography

GOSSIOS KJ.
Chest 100, 1469-1470, 1991
NAID 30030215225

小児Winslow孔ヘルニアの1例 : 自験例と本邦報告例の検討

亀岡一裕,田中富雄,高山有道,嵩原裕夫,古味信彦
日本小児外科学会雑誌 25(4), 703-708, 1989-06-20
… Hernia through the foramen of Winslow is extremely rare lesion, and only 10 cases, including one pediatric patient, have been reported in Japan. … The abdominal X-ray films show some characteristic findings, intestinal gas-fluid levels in the lesser omental sac separating from the stomach and colon cut-off sign of the hepatic flexure due to the dilated intestinal loop. …
NAID 110002101014

「網嚢孔」

Omental foramen
	Horizontal disposition of the peritoneum in the upper part of the abdomen.
	Entry to omental bursa (black arrow) by omental foramen (white mark)
Details
Latin	foramen omentale
Identifiers
Gray's	p.1156
TA	A10.1.02.403
FMA	14711
	Anatomical terminology