What is the name of the membrane that lines the inside of the abdomen?

The membrane that lines the inside of the abdomen is called the peritoneum. This serous membrane provides a protective barrier and lubricates the abdominal cavity, allowing for smooth movement of the organs. It plays an important role in supporting the organs and facilitating their function by minimizing friction. The peritoneum also has a role in fluid balance and immune response in the abdominal cavity.

The other terms refer to different membranes or structures in the body. The pericardium is the membrane surrounding the heart. Pleuritis refers to inflammation of the pleura, which is the membrane surrounding the lungs. Mesothelium is a type of tissue layer that makes up serous membranes, such as the peritoneum, but it is not specific to the abdomen alone. Understanding the specific functions and locations of these membranes will help clarify their distinct roles in human anatomy.