Purkinje fibers

(redirected from Purkinje fibre)
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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 ?
Myofibrillar M-bands developed an earlier stage in Purkinje fibres than in ordinary myocytes.
Thornell, "The development of Purkinje fibres and ordinary myocytes in the bovine fetal heart.
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.
Similar changes have been found in the locus caeruleus and the cerebellar cortex, the loss of Purkinje fibres in the latter increasing markedly after the age of 60[31].