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.
He was branded the King of Pop when he was alive. And it seems Michael Jackson still is after his death, after his album 'Thriller' has become the first record to sell 30 million copies in the US. Released on November 30 1982, the iconic LP has also achieved over 100 million global sales. Scroll down for video