The myocardium is the muscle tissue of the heart, and forms a thick middle layer between the outer epicardium layer and the inner endocardium layer.
en.wikipedia.org These epicardium cells could be transplanted to the patient and potentially repair the damaged region.
newatlas.com When this layer comes into contact with the heart (not the great vessels), it is known as the epicardium.
en.wikipedia.org Hemorrhagic smallpox also produces a dusky erythema, petechiae, and hemorrhages in the spleen, kidney, serosa, muscle, and, rarely, the epicardium, liver, testes, ovaries and bladder.
en.wikipedia.org Dogs and cats with tricuspid valve dysplasia often also have an open foramen ovale, an atrial septal defect, or inflammation of the right atrial epicardium.
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