Serous Membrane Serous Membrane is composed of a layer simple squamous epithelium resting on a thin layer of areolar connective tissue. The Serous membranes line body cavities that are closed to the exterior. Serous membrane occurs in pairs. The parietal layer lines a specific portion of the wall of the ventral body cavity. It folds in on itself to form the visceral layer, which then converts the outside of the organs in that cavity. These layers are separated by a scanty amount of thin, clear fluid, called serous fluid, which is secreted by both membranes.
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What is an APO address or an FPO address? APO/FPO addresses are for mail that is being sent to or received from military installations located out the continental US. This mail may be official or personal in nature. APO/FPO addresses are not international addresses. The mail is delivered through a joint effort between USPS and the Military Postal Service.