Relating to both the outer layer of the heart muscle (epicardium) and the thick muscular wall of the heart (myocardium).
From Greek epi- (upon) + myo- (muscle) + cardial (of the heart). A modern medical term combining prefixes to describe heart tissue relationships.
The epicardium and myocardium are adjacent heart layers with completely different jobs—the epicardium is a slippery protective layer while the myocardium is the powerful muscle that actually pumps blood.
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