#pericardium  a double-layered serous membrane that surrounds the heart
  supertype:  serous_membrane__serosa  a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid
  part:  epicardium__visceral_pericardium  the innermost of the two layers of the pericardium
  part:  parietal_pericardium  the tough outermost layer of the pericardium that is attached to the diaphragm and the sternum

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