lesser omentum

WordNet

1. comparative of little; "she walks less than she should"; "he works less these days"
2. used to form the comparative of some adjectives and adverbs; "less interesting"; "less expensive"; "less quickly" (同)to a lesser extent
3. (comparative of `little usually used with mass nouns) a quantifier meaning not as great in amount or degree; "of less importance"; "less time to spend with the family"; "a shower uses less water"; "less than three years old"
4. (nonstandard in some uses but often idiomatic with measure phrases) fewer; "less than three weeks"; "no less than 50 people attended"; "in 25 words or less"
5. (usually preceded by `no'
6. smaller in size or amount or value; "the lesser powers of Europe"; "the lesser anteater"
7. of less size or importance; "the lesser anteater"; "the lesser of two evils"
8. a fold of peritoneum supporting the viscera

PrepTutorEJDIC

1. (量が)(…より)『もっと少ない』,いっそう少ない;(大きさ・価値・程度などが)(…より)『もっと少ない』,さらに劣る,もっと低い《+『than』…》 / もっと少なく,…ほどでなく《+『than…』》 / 《形容詞・副詞の劣勢の意の比較級を作るのに用いて》…ほど…でない《+『than…』》 / さらに少ない数(量) / …だけ足りない,を引いた
2. 『いっそう小さい(少ない,重要でない)』,より劣った

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/06/03 17:56:18」(JST)

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Lesser omentum
The lesser omentum extends from the liver to the stomach and the duodenum
Details
Identifiers
Latin	Omentum minus
MeSH	A01.047.025.600.573
Dorlands /Elsevier	o_03/12589823
TA	A10.1.02.101
FMA	9715
Anatomical terminology [edit on Wikidata]

The lesser omentum (small omentum or gastrohepatic omentum) is the double layer of peritoneum that extends from the liver to the lesser curvature of the stomach (hepatogastric ligament) and the first part of the duodenum (hepatoduodenal ligament).

Structure

The primitive mesentery of a six weeks’ human embryo, half schematic. (Lesser omentum labeled at left.)

Schematic and enlarged cross-section through the body of a human embryo in the region of the mesogastrium, at end of third month

The lesser omentum is extremely thin, and is continuous with the two layers of peritoneum which cover respectively the antero-superior and postero-inferior surfaces of the stomach and first part of the duodenum.

When these two layers reach the lesser curvature of the stomach and the upper border of the duodenum, they join together and ascend as a double fold to the porta hepatis.

To the left of the porta, the fold is attached to the bottom of the fossa for the ductus venosus, along which it is carried to the diaphragm, where the two layers separate to embrace the end of the esophagus.

At the right border of the lesser omentum, the two layers are continuous, and form a free margin which constitutes the anterior boundary of the omental foramen.

Divisions

Anatomically, the lesser omentum is divided into ligaments, each starting with the prefix "hepato" to indicate that it connects to the liver at one end.

Most sources divide it into two parts:

• hepatogastric ligament: the portion connecting to the lesser curvature of the stomach
• hepatoduodenal ligament: the portion connecting to the duodenum

In some cases, the following ligaments are considered part of the lesser omentum:

• hepatophrenic ligament: the portion connecting to the thoracic diaphragm
• hepatoesophageal ligament: the portion connecting to the esophagus
• hepatocolic ligament: the portion connecting to the colon

Contents

Between the two layers of the lesser omentum, close to the right free margin, are the hepatic artery, the common bile duct, the portal vein, lymphatics, and the hepatic plexus of nerves—all these structures being enclosed in a fibrous capsule (Glisson's capsule).

Between the layers of the lesser omentum, where they are attached to the stomach, run the right and left gastric arteries, as well as the gastric veins.

Additional images

• Diagrams to illustrate the development of the greater omentum and transverse mesocolon.

• Horizontal disposition of the peritoneum in the upper part of the abdomen.

See also

• Peritoneum
• Greater omentum

References

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

External links

• Anatomy figure: 37:04-01 at Human Anatomy Online, SUNY Downstate Medical Center - "The stomach and lesser omentum."
• Anatomy photo:37:05-0100 at the SUNY Downstate Medical Center - "Abdominal Cavity: The Lesser Omentum"
• Anatomy photo:38:03-0102 at the SUNY Downstate Medical Center - "Stomach, Spleen and Liver: Contents of the Hepatoduodenal Ligament"
• Anatomy image:7823 at the SUNY Downstate Medical Center
• Anatomy image:8147 at the SUNY Downstate Medical Center
• Peritoneal Cavity Development - Page 6 of 14 anatomy module at med.umich.edu

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Related Links

• Lesser omentum | definition of lesser omentum by Medical ...

omentum [o-men´tum] (L.) a fold of peritoneum extending from the stomach to adjacent abdominal organs. adj., adj omen´tal. gastrocolic omentum greater omentum. gastrohepatic omentum lesser omentum. greater omentum a ...

• Lesser-omentum | Define Lesser-omentum at Dictionary.com

lesser omentum n. A peritoneal fold passing from the margins of the portal fissure to the lesser curvature of the stomach and to the upper border of the duodenum. Also called omentulum.

Related Pictures

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★リンクテーブル★

リンク元	「小網」「omentum minus」
関連記事	「less」「omentum」

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• 肝胃間膜と肝十二指腸間膜からなる
• 小網は胃の小弯と十二指腸の近位部を肝臓につなぐ(M.131)

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lesser omentum

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