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The greater omentum (also the great omentum, omentum majus, gastrocolic omentum, epiploon, or, especially in animals, caul) is a large apron-like fold of visceral peritoneum that hangs down from the stomach. It extends from the greater curvature of the stomach, passing in front of the small intestines and reflects on itself to ascend to the transverse colon before reaching to the posterior abdominal wall. The greater omentum is larger than the lesser omentum which hangs down from the liver to the lesser curvature. The common anatomical term "epiploic" derives from "epiploon" from the Greek "epipleein" meaning to float or sail on, since the greater omentum appears to float on the surface of the intestines. It is the first structure observed when the abdominal cavity is opened anteriorly.〔Drake, Richard L., et al. Gray's anatomy for students. Philadelphia, PA: Churchill Livingstone/Elsevier, 2010. Print.〕 ==Structure== The greater omentum is the largest of the two peritoneal folds. It consists of a double sheet of peritoneum, folded on itself so that it is made up of four layers. The two layers of the greater omentum descend from the greater curvature of the stomach and the beginning of the duodenum. They pass in front of the small intestines, sometimes as low as the pelvis; they then turn upon themselves, and ascend as far as the transverse colon, where they separate and enclose that part of the intestine. These individual layers are easily seen in the young, but in the adult they are more or less inseparably blended. The left border of the greater omentum is continuous with the gastrosplenic ligament; its right border extends as far as the commencement of the duodenum. The greater omentum is usually thin, and has a perforated appearance. It contains some adipose tissue, which can accumulate considerably in obese people. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Greater omentum」の詳細全文を読む スポンサード リンク
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