<Ul> <Li> <P> Cutaway illustration of pericardial sac </P> </Li> <Li> <P> Fibrous pericardium </P> </Li> </Ul> <Li> <P> Cutaway illustration of pericardial sac </P> </Li> <P> Cutaway illustration of pericardial sac </P> <Li> <P> Fibrous pericardium </P> </Li>

The deepest layer of the pericardium and pleura is the