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Aug 17, 2023 · Learn about the anatomy and physiology of the cardiac conduction system, a network of specialized cells that initiate and transmit electrical impulses for heart contractions. Find out the key facts, clinical notes and sources of the SA node, AV node, bundle of His and Purkinje fibers.
- Sinoatrial Node
- Atrioventricular Node
- Atrioventricular Bundle
- Purkinje Fibres
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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...
Learn about the anatomy and function of the cardiac conduction system, which consists of the SA node, AV node, bundle of His and Purkinje fibres. Find out how they generate and transmit electrical impulses to coordinate heart contraction and blood flow.
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Jul 23, 2021 · Learn how the heart conduction system controls your heartbeat with electrical signals and specialized cells. Find out about common conditions that affect your heart rhythm and how to keep your heart healthy.
The conduction system consists of specialized heart muscle cells, situated within the myocardium. There is a skeleton of fibrous tissue that surrounds the conduction system which can be seen on an ECG. Dysfunction of the conduction system can cause irregular heart rhythms including rhythms that are too fast or too slow.
- systema conducens cordis
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Learn how the heart's electrical system controls its rhythm and function. Find out the parts, anatomy and conditions of the cardiac conduction system.
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May 10, 2020 · The heart has two main types of cells: 1. Conducting cells: generate and propagate electrical impulses. Contractile (muscle) cells: contract following receipt of electrical impulses. These cells can also propagate and, on occasion, generate electrical impulses. Both conducting and specialised muscle cells form the hearts conduction system and ...
The conduction system of the heart. Normal excitation originates in the sinoatrial (SA) node, then propagates through both atria (internodal tracts shown as dashed lines). The atrial depolarization spreads to the atrioventricular (AV) node, passes through the bundle of His (not labeled), and then to the Purkinje fibers which make up the left ...
