atrioventricular node

American  

noun

Anatomy.

1. a small mass of muscular fibers at the base of the wall between the atria, conducting impulses received from the sinoatrial node by way of the atrioventricular bundles and, under certain conditions, functioning for the sinoatrial node as pacemaker of the heart.

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atrioventricular node Scientific  

/ ā′trē-ō-vĕn-trĭk′yə-lər /

1. A small area of specialized cardiac muscle cells that conducts impulses from the sinoatrial node to the ventricles and initiates the contraction of the ventricles. It is located in the right atrium.

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Etymology

Origin of atrioventricular node

First recorded in 1930–35

Example Sentences

Electrical charges pulse from the SA node causing the two atria to contract in unison; then the pulse reaches the atrioventricular node between the right atrium and right ventricle.

From Textbooks • Jun. 9, 2022

It is the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node.

From Textbooks • Jun. 9, 2022

How does the delay of the impulse at the atrioventricular node contribute to cardiac function?

From Textbooks • Jun. 19, 2013

This impulse spreads from its initiation in the SA node throughout the atria through specialized internodal pathways, to the atrial myocardial contractile cells and the atrioventricular node.

From Textbooks • Jun. 19, 2013

Regardless of the pathway, as the impulse reaches the atrioventricular septum, the connective tissue of the cardiac skeleton prevents the impulse from spreading into the myocardial cells in the ventricles except at the atrioventricular node.

From Textbooks • Jun. 19, 2013