Purkinje Fiber


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Purkinje Fiber

 

a cellular element found in the conduction system of ventricular myocardium; described in 1845 by J. E. Purkinje. Purkinje fibers are particularly large in ruminants. They have been studied mainly in mammals but appear to exist in other vertebrates as well. Although they are of muscular origin, Purkinje fibers have largely lost their contractile function and have become specialized in the conduction of excitation to contractile elements of the myocardium; this accounts for their meager number of myofibrils. Purkinje fibers are usually thicker than the contractile fibers of the myocardium and are rich in mitochondria and glycogen.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
A comparative ultrastructural study of bovine Purkinje fibers and common myocytes during fetal development has been undertaken by Forsgren and Thornell [6].
In all stages studied, a redundancy of intermediate filaments was typical for the Purkinje fibers. Myofibrillar M-bands developed an earlier stage in Purkinje fibres than in ordinary myocytes.
Intracellular pH and cell-to-cell transmission in sheep Purkinje fibers // Biophys.
Effects of intracellular calcium ions, verapamil, and lanthanum on active and passive properties of canine cardiac Purkinje fibers. Circ.
Since the sinus node is the normal pacer, latent pacing sites at the AV junction or ventricular Purkinje fibers are driven to low resting potentials by the sinus node and have lower rates of normal automaticity (Abraham, 1992).
The conduction system comprises the sinus (SA) node, atrioventricular (AV) node, bundle of His (common bundle), right bundle branch (RBB), left bundle branch (LBB), and Purkinje fibers.