SA nodal artery

SA Nodal Artery

The SA nodal artery is shown in this illustration from Gray's Anatomy.

The SA nodal artery (Sinoatrial nodal artery) is a small blood vessel in the heart that supplies the sinoatrial node. It is a branch of either the right coronary artery (RCA) or the circumflex artery (Cx), depending on the individual's coronary circulation.

Anatomy

The SA nodal artery typically arises from the RCA in about 55-60% of people, and from the Cx in about 40-45%. It follows the crista terminalis to reach the SA node, which is located at the junction of the superior vena cava and the right atrium.

Clinical significance

The SA nodal artery is of clinical importance because it supplies the SA node, the natural pacemaker of the heart. Blockage of this artery can lead to sinoatrial node dysfunction, which can cause a slow heart rate (bradycardia) or a fast heart rate (tachycardia).

See also

• Coronary arteries
• Sinoatrial node
• Coronary circulation

References

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