Purkinje fibers

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Purkinje fibers

[pər′kin·jē ‚fī·bərz]
(histology)
Modified cardiac muscle fibers composing the terminal portion of the conducting system of the heart.
References in periodicals archive ?
Objective: This study was planned to investigate ventricular myocardial excitation in birds in which Purkinje fibres penetrate into the ventricular wall and reach the epicardium to advance our knowledge about the evolution of the ventricular activation process in vertebrates.
In theory, in multifocal ("flash") activation of avian ventricular myocardium (1-3) caused by the specific distribution of Purkinje fibres that penetrate deeply into the ventricular wall and run close to the epicardium (1, 4, 5) there must not appear considerable disturbances in the myocardial activation pattern under local disturbances of conduction.
The non-multifocal activation pattern of the ventricular myocardium during ventricular pacing might signify that Purkinje fibres do not participate in myocardial activation.
4 m/s and the length of the heart ventricles of 20-25 mm in chickens; 2) in so me cases, foci of activation were located ahead of the main depolarization front and their merging for one millisecond were observed in the ventricular wall during pacing; 3) duration of activation of the LV free wall is minimal during pacing of subendocardial layers of the middle part of the LV free wall that are the most "rich" in Purkinje fibres as compared to the located on a level with them intramural and subepicardial layers (Table 1).