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Function [edit]. 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.
The pericardium is the double walled sac that contains the heart and the roots of the great vessels that leave from or enter the heart. There are two layers of the pericardial sac: Fibrous Pericardium: The fibrous pericardium is a strong layer which covers the heart. It is made up mostly of connective tissue. Its job is to protect the heart from overstretching and also anchor it in place. This layer is the most superficial layer of the pericardium.