Bundle of His, or atrioventricular bundle, is a bundle of special muscle ?bres which pass from the atria to the ventricles of the HEART and which form the pathway for the impulse which makes the ventricles contract, the impulse originating in the part of the atria known as the sinuatrial node.
see atrioventricular bundle. [W. His (1863–1934), Swiss anatomist]
An abnormality of the conduction of electrical impulses through the ventricles of the HEART, resulting in delayed depolarisation of the ventricular muscle. The electrocardiograph (see ELECTROCARDIOGRAM (ECG)) shows characteristic widening of the QRS complexes. Abnormalities of the right and left bundle branches cause delayed contraction of the right and left ventricles respectively.... bundle branch block
(AV bundle, bundle of His) a bundle of modified heart muscle fibres (Purkinje fibres) passing from the *atrioventricular node forward to the septum between the ventricles, where it divides into right and left bundles, one for each ventricle. The fibres transmit contraction waves from the atria, via the AV node, to the ventricles.... atrioventricular bundle
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