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.
Dr. Conrad Murray, the man convicted of involuntary manslaughter in the death of Michael Jackson, will likely serve only half of his four-year jail sentence due to a recent change in California law that allows non-violent felony offenders to serve their time in county jail instead of state prison.