The serous membrane is a thin layer of tissue that lines certain cavities in the body and covers the organs within those cavities. It produces a fluid called serous fluid, which acts as a lubricant, reducing friction between the organs as they move. This membrane is found in areas such as the thoracic cavity (around the lungs) and the abdominal cavity (around the digestive organs). There are two main layers of the serous membrane: the parietal layer, which lines the cavity walls, and the visceral layer, which covers the organs themselves. The serous membrane plays a crucial role in protecting organs and facilitating smooth movement, contributing to overall bodily function.