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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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The cardiac conduction system (CCS, also called the electrical conduction system of the heart) transmits the signals generated by the sinoatrial node – the heart's pacemaker, to cause the heart muscle to contract, and pump blood through the body's circulatory system.
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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.
May 10, 2020 · This article will discuss the components of the heart’s conduction system including their anatomy and clinical significance. 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 ...
Learn how the heart's electrical system controls its rhythm and function. Find out the parts, anatomy and conditions of the cardiac conduction system.
