Final answer:
The double sheets of peritoneum that suspend the stomach, small intestine, and portions of the large intestine within the peritoneal cavity are called mesenteries.
Step-by-step explanation:
The organs such as the stomach, small intestine, and portions of the large intestine are suspended within the peritoneal cavity by double sheets of peritoneum, called mesenteries.
The peritoneum is a broad serous membranous sac made up of squamous epithelial tissue surrounded by connective tissue. It has two regions: the parietal peritoneum, which lines the abdominal wall, and the visceral peritoneum, which envelops the abdominal organs. The peritoneal cavity is the space between these two layers, filled with a lubricating fluid to reduce friction.
The visceral peritoneum includes multiple large folds, which hold various abdominal organs in place and contain blood vessels, lymphatic vessels, and nerves supplying the adjacent organs.