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Answer:
A serous membrane is an epithelial membrane formed of mesodermally derived epithelium called the mesothelium that is backed by connective tissue. These membranes line cavities that do not reveal to the outside, and they cover the organs located within those cavities. Serous membranes have two layers:
- An external layer that lines the body cavity called parietal.
- An internal layer that includes internal organs called visceral.