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The walls of the ventral body cavity are covered by the serosa or serous membrane. The serous membrane is a thin, double-layered membrane. Below the serous membrane is the parietal serosa, and below that lies the visceral serosa. The walls are separated by a thing layer of lubricating fluid, which is called serous fluid. Serous fluid is secreted by both membranes.
The parietal serosa lines the cavity walls. The parietal pericardium lines the parietal cavity. The parietal pleura lines the walls of the thoracic cavity. Finally, the peritoneum is associated with the walls of the abdominopelvic cavity.
The visceral serosa covers the organs in the cavity. The visceral pericardium covers the heart within the cavity. The visceral pleura covers the lungs. Finally, the visceral peritoneum covers most of the organs within the cavity.
Serous Membranes