Myocardium of the Heart

Myocardium Definition

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Myocardium is the muscular middle layer of the wall of the heart. It is composed of spontaneously contracting cardiac muscle fibers which allow the heart to contract. Heart contraction is an autonomic (involuntary) function of the peripheral nervous system. The myocardium is surrounded by the epicardium (outer layer of the wall of the heart) and the endocardium (inner layer of the heart).

Function of the Myocardium

Myocardium stimulates heart contractions to pump blood from the ventricles and relaxes the heart to allow the atria to receive blood. These contractions produce what is known as a heart beat. The beating of the heart drives the cardiac cycle which pumps blood to cells and tissues of the body.

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Your Citation
Bailey, Regina. "Myocardium of the Heart." ThoughtCo, Aug. 27, 2020, Bailey, Regina. (2020, August 27). Myocardium of the Heart. Retrieved from Bailey, Regina. "Myocardium of the Heart." ThoughtCo. (accessed February 8, 2023).