The pericardium is a double-walled sac that contains the heart and the roots of the great vessels. The outer wall of the pericardium is composed of dense connective tissue. The portion of the inner wall of the pericardium that is in contact with the heart (but not in contact with the great vessels) is the epicardium. The epicardium contains the blood vessels supplying blood to heart muscle (the coronary arteries) as well as nerve fibers.
It's been three years since the world learned of Michael Jackson's death. Photos: Remembering the King of Pop Three Years Later.
Scroll down for video... 1  Tragedy: Michael Clarke Duncan, pictured with fiancÃ©e Omarosa Manigault-Stallworth in February at a Grammys party, has died aged 54, two months after suffering a severe heart attack. 2  Hollywood success: Michael was nominated for an Oscar following his performance in 1999's The Green Mile.