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The Purkinje fibers are located in the inner ventricular walls of the heart, just beneath the endocardium. These fibers consist of specialized cardiomyocytes that are able to conduct cardiac action potentials more quickly and efficiently than any other cells in the heart. Purkinje fibers allow the heart's conduction system to create synchronized contractions of its ventricles, and are therefore essential for maintaining a consistent heart rhythm.
U.S. National Library of Medicine
Modified cardiac muscle fibers composing the terminal portion of the heart conduction system.
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"purkinje fibers." Definitions.net. STANDS4 LLC, 2015. Web. 1 Dec. 2015. <http://www.definitions.net/definition/purkinje fibers>.