what are the layers of the heart wall quizlet?
['Epicardium. This is the outermost layer of the heart, and is one of the two layers of the pericardium.', 'Myocardium. This is the middle layer of the heart that contains the cardiac muscular tissue. ... ', 'Endocardium. This is the smooth innermost layer that keeps blood from sticking to the inside of the heart.']