The peritoneum is a serous membrane that forms the lining of the abdominal cavity. It supports the organs and serves as a conduit for their blood and lymph vessels and nerves.

The anterior layer of the peritoneum (on the abdominal wall) is the parietal peritoneum. The inside layer of peritoneum that surrounds the organs is the visceral peritoneum. Between these 2 layers is the peritoneal cavity.