myocardium

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The muscular tissue of the heart.

[New Latin : MYO– + Greek kardiā, heart.]

The thick, contractile middle layer of uniquely constructed and arranged muscle cells (cardiac muscle) that form the bulk of the heart wall.

The middle region of the wall of the heart composed mainly of cardiac muscle. Compare endocardium, epicardium.

The middle and thickest layer of the heart wall, composed of cardiac muscle.