- serous membrane
- serous membrane n any of various thin membranes (as the peritoneum, pericardium, or pleurae) that consist of a single layer of thin flat mesothelial cells resting on a connective-tissue stroma, secrete a serous fluid, and usu. line bodily cavities or enclose the organs contained in such cavities compare MUCOUS MEMBRANE
* * *a smooth transparent membrane, consisting of mesothelium and underlying elastic fibrous connective tissue, lining certain large cavities of the body. The peritoneum of the abdomen, pleura of the chest, and pericardium of the heart are all serous membranes. Each consists of two portions: the parietal portion lines the walls of the cavity, and the visceral portion covers the organs concerned. The two are continuous, forming a closed sac with the organs essentially outside the sac. The inner surface of the sac is moistened by a thin fluid derived from blood serum, which allows frictionless movement of organs within their cavities. Compare mucous membrane.
* * *tunica serosa.
Medical dictionary. 2011.