Search results
Oct 30, 2023 · The atrioventricular node receives its arterial blood supply from the atrioventricular nodal artery, which is a large arterial branch in the interventricular septum, arising from the right coronary artery.
- Coronary Vasculature
The blood supply to the heart arises from the left and right...
- Conduction System
The sinuatrial and atrioventricular nodes are connected...
- Coronary Vasculature
- Sinoatrial Node
- Atrioventricular Node
- Atrioventricular Bundle
- Purkinje Fibres
The sinoatrial (SA) nodeis a collection of specialised cells (pacemaker cells), and is located in the upper wall of the right atrium, at the junction where the superior vena cava enters. These pacemaker cells can spontaneously generateelectrical impulses. The wave of excitation created by the SA node spreads via gap junctions across both atria, res...
After the electrical impulses spread across the atria, they converge at the atrioventricular node– located within the atrioventricular septum, near the opening of the coronary sinus. The AV node acts to delay the impulses by approximately 120ms, to ensure the atria have enough time to fully eject blood into the ventricles before ventricular systole...
The atrioventricular bundle(bundle of His) is a continuation of the specialised tissue of the AV node, and serves to transmit the electrical impulse from the AV node to the Purkinje fibres of the ventricles. It descends down the membranous part of the interventricular septum, before dividing into two main bundles: 1. Right bundle branch– conducts t...
ThePurkinje fibres(sub-endocardial plexus of conduction cells) are a network of specialised cells. They are abundant with glycogen and have extensive gap junctions. These cells are located in thesubendocardial surfaceof the ventricular walls, and are able to rapidly transmit cardiac action potentials from the atrioventricular bundle to the myocardi...
- (148)
Jun 4, 2023 · The AV node receives its blood supply from the AV nodal artery; in 90% of people this artery branches from the right coronary artery. So AV nodal block due to a heart attack is most commonly seen with right coronary artery heart attacks.
The blood supply of the AV node is from the atrioventricular nodal branch. The origin of this artery is most commonly (80–90% of hearts) a branch of the right coronary artery , with the remainder originating from the left circumflex artery .
Jul 13, 2023 · The blood supply to the heart arises from the left and right semilunar cusps of the aortic valve (respectively): The left coronary artery gives rise to the anterior interventricular (left anterior descending) and the left circumflex arteries.
Jul 25, 2023 · In a right-dominant heart, the atrioventricular node is supplied by the right coronary artery. The purpose of this structure is to connect the electrical systems of the atria and the ventricles, providing electrical impedance from the atria and an intrinsic pacemaker in its absence.
Aug 17, 2023 · The sinuatrial and atrioventricular nodes are connected through the internodal conduction pathways providing fast action potentials transmission. Located in the interatrial septum, the AV node conducts electrical impulses from the SA node to the heart ventricles.
