The SA node, or sinoatrial node, is also known as the sinus node.
The sinoatrial node (SA node) is the heart's natural pacemaker. It's a small cluster of specialized cells located in the upper right atrium of the heart. These cells spontaneously generate electrical impulses that trigger the heart to beat. Its primary function is to maintain a steady and regular heartbeat. Several references confirm this, including the Cleveland Clinic which states that "Sick sinus syndrome is the name for heart rhythm problems that happen because your sinoatrial node (or sinus node) isn't working right." https://my.clevelandclinic.org/health/diseases/21789-sick-sinus-syndrome Similarly, Mount Sinai describes it as "the sinoatrial node, sinus node or SA node." https://www.mountsinai.org/health-library/diseases-conditions/sick-sinus-syndrome The SA node's crescent shape and location at the junction of the crista terminalis and superior vena cava are also well documented.
Here's a summary of the key information:
- Primary Name: Sinoatrial Node (SA Node)
- Alternative Name: Sinus Node
- Location: Upper right atrium of the heart
- Function: Natural pacemaker, generating electrical impulses to regulate heartbeat.
