sinoatrial node


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Related to sinoatrial node: atrioventricular node, bundle of His

sinoatrial node

[¦sī·nō′ā·trē·əl ′nōd]
(anatomy)
A bundle of Purkinje fibers located near the junction of the superior vena cava with the right atrium which acts as a pacemaker for cardiac excitation. Abbreviated SA node. Also known as sinoauricular node.
References in periodicals archive ?
The sinoatrial node is the primary pacemaker, which conducts the electrical impulse to the atrioventricular node and by way of the atrioventricular bundle to the ventricles.
The heartbeat originates in the sinoatrial node (SAN) of the heart's right upper chamber, where pacemaker cells are clustered.
Normally, the electrical signal that tells your heart to beat comes from the sinoatrial node, or SA node, in the right atrium.
These cells control the heart rate by sending electrical signals from the sinoatrial node in the heart's right atrium - upper chamber, to the ventricles - lower chambers, causing them to contract and pump blood.