<P> Pericardial fluid is the serous fluid secreted by the serous layer of the pericardium into the pericardial cavity . The pericardium consists of two layers, an outer fibrous layer and the inner serous layer . 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 . </P> <P> The pericardial fluid reduces friction within the pericardium by lubricating the epicardial surface allowing the membranes to glide over each other with each heart beat . </P>

Where is serous fluid found in the heart
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