It is a collection of cells that carry electrical signals from the AV node to the bundle branches. The electrical system that controls the heartbeat is made up of several parts that signal the heart muscle to contract. The SA node initiates the sequence, causing the atria, or upper chambers of the heart, to contract. The electrical current then travels through the AV node, bundle of His, bundle branches, and Purkinje fibers.
This causes the ventricles, the lower chambers of the heart, to contract. The normal sequential flow of electrical signals produce a normal heartbeat. The bundle branches are a part of the electrical system of the heart. Save This Word! We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms. Words nearby bundle of His bundh , bundle , bundle-branch block , bundle buggy , bundled , bundle of His , bundle of nerves , bundle scar , bundle sheath , bundle up , bundobust.
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List of terms related to Bundle of His. Editor-In-Chief: C. Michael Gibson, M. The bundle of His is a collection of heart muscle cells specialized for electrical conduction that transmits the electrical impulses from the AV node located between the atria and the ventricles to the point of the apex of the fascicular branches. The fascicular branches then lead to the Purkinje fibers which innervate the ventricles, causing the cardiac muscle of the ventricles to contract at a paced interval.
These specialized muscle fibres in the heart were named after the Swiss cardiologist Wilhelm His, Jr. The fibers of the Bundle of His allow electrical conduction to occur more easily and quickly than typical cardiac muscle. They are an important part of the electrical conduction system of the heart as they transmit the impulse from the AV node the ventricular pacemaker to the rest of the heart.
The bundle of His branches into the three bundle branches: the right, left anterior and left posterior bundle branches that run along the interventricular septum. The bundles give rise to thin filaments known as Purkinje fibers. These fibers distribute the impulse to the ventricular muscle. Together, the bundle branches and Purkinje network comprise the ventricular conduction system. It takes about 0. If the Bundle of His becomes blocked, there will be dissociation between the activity of the atria and the ventricles.
This complete dissociation between the atria and the ventricles is called third degree heart block. Other causes of third degree heart block would be complete block of the right, left anterior, and left posterior bundle branches. Third degree block is a serious medical condition that often requires insertion of an artificial pacemaker.
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