WordNet

remarkable or out of the ordinary in degree or magnitude or effect; "a great crisis"; "had a great stake in the outcome"
a person who has achieved distinction and honor in some field; "he is one of the greats of American music"
of major significance or importance; "a great work of art"; "Einstein was one of the outstanding figures of the 20th centurey" (同)outstanding
relatively large in size or number or extent; larger than others of its kind; "a great juicy steak"; "a great multitude"; "the great auk"; "a great old oak"; "a great ocean liner"; "a great delay"
greater in size or importance or degree; "for the greater good of the community"; "the greater Antilles"
a fold of peritoneum supporting the viscera

PrepTutorEJDIC

(規模・範囲などが)『大きい』,巨大な / 『多数の』;『多量の』 / 『偉大な』,すぐれた;《the Great》《称号・肩書に用いて》 / (身分・地位などの)高い / 気高い,崇高な / 《名詞の前にのみ用いて》重要な,重大な / 《人を表す名詞の前にのみ用いて》大の,たいへんな / 《話》すてきな,すばらしい / 《名詞的に》《the great》偉大な人たち,重要人物 / とても,すごく / とてもよく(very well) / 大物,花形
(都市が)郊外を含んでいる

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/01/29 11:19:10」(JST)

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Functions

The functions of the greater omentum are:

Fat deposition, having varying amounts of adipose tissue^[1]
Immune contribution, having milky spots of macrophage collections^[1]
Infection and wound isolation; It may also physically limit the spread of intraperitoneal infections.^[1] The greater omentum can often be found wrapped around areas of infection and trauma.

Structure

The greater omentum is the largest peritoneal fold. It consists of a double sheet of peritoneum, folded on itself so that it is made up of four layers.

The two layers which descend from the greater curvature of the stomach and commencement of the duodenum pass in front of the small intestines, sometimes as low down as the pelvis; they then turn upon themselves, and ascend again as far as the transverse colon, where they separate and enclose that part of the intestine.

These individual layers may be easily demonstrated in the young subject, but in the adult they are more or less inseparably blended.

The left border of the greater omentum is continuous with the gastrolienal ligament; its right border extends as far as the commencement of the duodenum.

The greater omentum is usually thin, presents a cribriform appearance, and always contains some adipose tissue, which in obese people accumulates in considerable quantity.

Subdivisions

The greater omentum is often defined to encompass a variety of structures. Most sources include the following two:^[2]^[3]

Gastrocolic ligament - to transverse colon (occasionally on its own considered synonymous with "greater omentum"^[2])
Gastrosplenic ligament - to spleen

The splenorenal ligament (from the left kidney to the spleen) is occasionally considered part of the greater omentum.^[4]^[5]

Blood Supply

The right and left gastroepiploic vessels provide the sole blood supply to the greater omentum. Both are branches of the celiac trunk. The right gastroepiploic is a branch of the gastroduodenal artery, which is a branch of the common hepatic artery, which is a branch of the celiac trunk. The left gastroepiploic artery is the largest branch of the splenic artery, which is a branch of the celiac trunk. The right and left gastroepiploic vessels anastomose within the two layers of the anterior greater omentum along the greater curvature of the stomach.

Development

The greater omentum develops from the dorsal mesentery that connects the stomach to the posterior abdominal wall. During stomach development, the stomach undergoes its first 90° rotation along the axis of the embryo, so that posterior structures are moved to the left and structures anterior to the stomach are shifted to the right. As a result, the dorsal mesentery folds over on itself, forming a pouch with its blind end on the left side of the embryo. A second approximately 90° rotation of the stomach, this time in the frontal plane, moves structures inferior if they were originally to the left of the stomach, and superior if they were originally to the stomach's right. Consequently, the blind-ended sac (also called the lesser sac) formed by the dorsal mesentery is brought inferiorly, where it assumes its final position as the greater omentum. It grows to the point that it covers the majority of the small and large intestine.

Omentectomy

Omentectomy refers to the surgical removal of the omentum, a relatively simple procedure with no major side effects, that is performed in cases where there may be spread of cancerous tissue into the omentum. Examples for this conditions are ovarian cancer and advanced or aggressive endometrial cancer as well as intestinal cancer. The procedure is generally done as an add-on when the primary lesion is removed.

Additional images

Greater omentum
The celiac artery and its branches; the liver has been raised, and the lesser omentum and anterior layer of the greater omentum removed.
Schematic figure of the bursa omentalis, etc. Human embryo of eight weeks.
Diagrams to illustrate the development of the greater omentum and transverse mesocolon.

References

^ ^a ^b ^c The omentum: A unique organ of exceptional versatility Indian Journal of Surgery, May 1, 2006, Alagumuthu, M; Das, Bhupati; Pattanayak, Siba; Rasananda, Mangual
^ ^a ^b Dalley, Arthur F.; Moore, Keith L. (2006). Clinically oriented anatomy. Hagerstown, MD: Lippincott Williams & Wilkins. p. 237. ISBN 0-7817-3639-0.
^ Anatomy Tables - Stomach & Spleen
^ Kyung Won, PhD. Chung (2005). Gross Anatomy (Board Review). Hagerstown, MD: Lippincott Williams & Wilkins. p. 205. ISBN 0-7817-5309-0.
^ "Module - Peritoneal Cavity Development". http://anatomy.med.umich.edu/modules/peritoneal_dev_module/peritoneal_04.html. Retrieved 2007-12-01.

External links

SUNY Figs 37:03-07
SUNY Figs 37:05-12
SUNY Labs 37:07-0100
Diagram at Tn.edu
Photo of model at Waynesburg College digirep/greateromentum

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Related Pictures

★リンクテーブル★

リンク元	「大網」「omental」「epiploic」「omentum majus」
関連記事	「great」「omentum」

「大網」

Greater omentum
	Vertical disposition of the peritoneum. Main cavity, red; omental bursa, blue. (Greater omentum labeled at left.)
	Diagrams to illustrate two stages in the development of the digestive tube and its mesentery. The arrow indicates the entrance to the bursa omentalis.
Latin	omentum majus
Gray's	subject #246 1157
Precursor	Dorsal mesentery
MeSH	Omentum