The combined tissue formed by the epicardium and myocardium of the heart considered as a functional unit.
From Greek epi- (upon) + myo- (muscle) + cardium (heart). A medical anatomical term treating two distinct layers as a single structural entity.
The epimyocardium is like thinking of a sandwich's filling and middle layer as one thing—anatomically they're different, but functionally they work together to make your heart beat.
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