Endocardium Myocardium Pericardium (or epicardium)

The heart is a muscular organ that contracts rhythmically pumping the blood through the . Its walls consist of of three tunics or layers : the internal or endocardium , the middle or myocardium and the external or pericardium .

The endocardium is homologous with the intima of the blood vessels. It consists of a single layer of squamous endothelial cells resting on a thin subendothelial layer of loose connective tissue.

The myocardium is the thickest of the three tunics. It consists of cardiac muscle tissue.

The pericardium is a serous membrane in which the heart lies. The visceral layer of the pericardium corresponds to epicardium, which covers the heart externally.

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