conduction system

Left Bundle Branch

Left Bundle Branch The structure indicated is the left bundle branch of the cardiac conducting system. The conduction system of the heart is responsible for the synchronised contraction of the atria and ventricles and is comprised of the following main structures: Sinoatrial node Atrioventricular node Atrioventricular bundle of His Right and left bundle branches Purkinje fibres The electrical activity of the heart begins in the sinoatrial node and travels to the atrioventricular node. From the atrioventricular node the impulses pass down the Bundle of His, whereupon the conducting fibres divide into the right and left bundle branches. The right bundle …

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left bundle branch

Purkinje Fibres

Purkinje Fibres The diagram indicates purkinje fibres. The conduction system of the heart is responsible for the synchronised contraction of the atria and ventricles and is comprised of the following main structures: Sinoatrial node Atrioventricular node Atrioventricular bundle of His Right and left bundle branches Purkinje fibres The atrioventricular nodes receives signals from the sinoatrial node. The impulses from the atrioventricular node then pass to the Bundle of His and then follow the left and right bundle branches through the interventricular septum and ultimately to the Purkinje fibres which propagate the signal into the ventricles. Purkinje fibres are located on …

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purkinje fibres

Atrioventricular Node

Atrioventricular Node The structure indicated is the atrioventricular node. The conduction system of the heart is responsible for the synchronised contraction of the atria and ventricles and is comprised of the following main structures: Sinoatrial node Atrioventricular node Atrioventricular bundle of His Right and left bundle branches Purkinje fibres The atrioventricular node is located centrally in the Triangle of Koch, between the atria and ventricles in the infero-posterior portion of the interatrial septum close to the opening of the coronary sinus. The triangle of Koch has the following boundaries: Ostium of coronary sinus Tendon of Todaro Anterior-septal leaflet commissure The …

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atrioventricular node

Sinoatrial Node

Sinoatrial Node The structure indicated is the sinoatrial node The conduction system of the heart is responsible for the coordinated contraction of the atria and ventricles and is comprised of the following main structures: Sinoatrial node Atrioventricular node Atrioventricular bundle of His Right and left bundle branches Purkinje fibres The sinoatrial node, often referred to as the SA node, is the pacemaker of the heart. It is located in the right atrium and is responsible for generating normal sinus rhythm. The sinoatrial node is located lateral to the junction where the superior vena cava enters the right atrium. Electrical signals generated …

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sinoatrial node