<Tr> <Th> FMA </Th> <Td> 9869 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> The pericardium is a double - walled sac containing the heart and the roots of the great vessels . The pericardial sac has two layers, a serous layer and a fibrous layer . It encloses the pericardial cavity which contains pericardial fluid . </P> <P> The pericardium fixes the heart to the mediastinum, gives protection against infection, and provides the lubrication for the heart . It receives its name from Ancient Greek peri (περί; "around") and cardion (κάρδιον; "heart"). </P>

The fibrous sac covering of the heart which is in contact with the pleura is the