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.
In the weeks since [artist id=1102]Michael Jackson's[/artist] death, his posthumous sales have gone through the roof, regularly outperforming the top new releases on the Billboard albums chart. Jackson's Number Ones has done the biggest numbers, but demand for his classic Thriller isn't far behind. In fact, sales have been so robust that the Recording Industry Association of America is reporting that it's about to surpass the [artist id=1062]Eagles'[/artist] Their Greatest Hits (1971-1975) as the top-selling album of all time.