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Anatomy of the Heart

Sinoatrial Node

What is the sinoatrial node?

  • The sinoatrial (SA) node is a section of nodal tissue that is located in the upper wall of the right atrium. The SA node is also referred to as the pacemaker of the heart.


  • Sets the rate of contraction for the heart.

  • Spontaneously contracts and generates nerve impulses that travel throughout the heart wall causing both atria to contract.

Image courtesy of Carolina Biological Supply/Access Excellence

Cardiac Conduction

Cardiac Cycle

Back to Anatomy of the Heart

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