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There are four serous membranes (pericardium, pleura, peritoneum, vaginal process). Beside their names they differ in: A] location B] structure C] function D] all of the above E] none of the above. There are four major serous membrane cavities (pericardial, peritoneal, & two pleural). The four major cavities develop. . .
This serous layer has two membranes which enclose the pericardial cavity into which is secreted the pericardial fluid. The fluid is similar to the cerebrospinal fluid of the brain which also serves to cushion and allow some movement of the organ.