What does the peritoneal cavity contain?

The peritoneal cavity, which is the potential space within the abdominal cavity, primarily contains peritoneal fluid. This fluid serves several important functions, including acting as a lubricant that facilitates movement between the abdominal organs, thereby reducing friction. It also helps to protect and cushion the organs against injury. The presence of peritoneal fluid is crucial for maintaining the health and functionality of the organs within the cavity, as it allows for free movement and reduces the likelihood of adhesions forming between organs.

Other contents, like blood and lymph, are not typically found within the peritoneal cavity as they are contained within blood vessels and lymphatic vessels. A layer of muscle is not a component of the peritoneal cavity; rather, the walls of the abdomen consist of layers of muscle and other tissues surrounding it. Neural tissues are also not located in the peritoneal cavity, as nerve tissues are typically found in the brain, spinal cord, and peripheral nerves that control the body's functions.