Q:

The following is/are true concerning the anatomy of the conduction system:

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The following is/are true concerning the anatomy of the conduction system:


  1. There is no special conduction path from the sinoatrial (SA) to the atrioventricular (AV) node
  2. The blood supply to the AV node is from the anterior descending coronary artery
  3. The only normal muscular connection between atria and ventricles is the bundle of His
  4. The aortomitral continuity is the only area where supraventricular accessory pathways cannot occur
  5. The sinus node artery arises from the right or circumflex coronary artery

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a. There is no special conduction path from the sinoatrial (SA) to the atrioventricular (AV) node

c. The only normal muscular connection between atria and ventricles is the bundle of His

d. The aortomitral continuity is the only area where supraventricular accessory pathways cannot occur

e. The sinus node artery arises from the right or circumflex coronary artery

The SA node is located at the junction of the superior vena cava and the right atrial appendage and receives its blood supply from the right or circumflex coronary artery. There is no special conduction path between SA and AV nodes. The bundle of His is the only normal atrioventricular muscle connection but abnormal pathways can occur anywhere except the area known as the aortomitral continuity. The blood supply to the AV node is from the posterior descending coronary artery. 

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