The extensions of the peritoneum include which of the following?

• A. Mesentery
• B. Greater omentum
• C. Lesser omentum
• D. Mesentery and greater omentum

Answer: (D)

Extensions of the peritoneum are folds that connect abdominal organs to each other or to the posterior wall, forming pathways and support for vessels and nerves. A mesentery is a double layer of peritoneum that suspends the intestines from the posterior abdominal wall, carrying blood vessels, nerves, and lymphatics. The greater omentum is another extension, a wide, apron-like fold that hangs from the greater curvature of the stomach and drapes over the intestines, providing fat storage and immune support. The lesser omentum is also a peritoneal fold, linking the liver to the stomach and duodenum. In this context, the classic extensions highlighted are the mesentery and the greater omentum, which is why that pairing is the best match.