Greater omentum
Greater Omentum
The Greater Omentum (pronunciation: /ˈɡreɪtər ˈoʊmɪntəm/) 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 doubles back to ascend to the transverse colon before reaching to the posterior abdominal wall.
Etymology
The term 'Omentum' is derived from the Latin word 'omentum', which means 'fat skin'. The prefix 'Greater' is used to differentiate it from the smaller structure, the Lesser Omentum, which hangs down from the lesser curvature of the stomach.
Structure
The Greater Omentum is composed of four layers of peritoneum, containing in its areolar tissue adipose tissue, lymphatic vessels, lymph nodes, and blood vessels. It is attached to the greater curvature of the stomach and the proximal part of the duodenum. The other edge is attached to the transverse colon.
Function
The Greater Omentum plays a crucial role in immune responses, as it can migrate to inflamed organs and wall off infections. It also stores fat deposits, which can serve as an energy reserve.
Related Terms
- Lesser Omentum: A smaller peritoneal fold that connects the lesser curvature of the stomach and the proximal part of the duodenum to the liver.
- Peritoneum: The serous membrane that forms the lining of the abdominal cavity.
- Visceral Peritoneum: The inner layer of the peritoneum that is in contact with the abdominal and pelvic organs.
- Parietal Peritoneum: The outer layer of the peritoneum that lines the walls of the abdominal and pelvic cavities.
External links
- Medical encyclopedia article on Greater omentum
- Wikipedia's article - Greater omentum
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