| Front | Sinoatrial node |
|---|---|
| Back | (SA node) Structure: a small area of specialized cardiac muscle, located in the atrial wall near the point where the superior margin of the auricle meets the superior vena cava Function: the "pacemaker" of the heart with an intrinsic rhythm (70 contractions/minute) 1. initiates atrial contraction 2. depolarization spreads freely by myogenic conduction through atrial musculature towards the AV node 3. depolarization is prevented from spreading to ventricles by cardiac skeleton |
Tags: cardiovascular
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