Cardiac conduction system

Biological terminology

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The heart conduction system is a special system located in the heart muscle that can generate and transmit impulses Cardiac myocyte Composition, including Sinoatrial node ， Interknot fasciculus ， Atrioventricular node ， Atrioventricular fasciculus , right fascicular branch, Left fascicular branch^[2] And Purkinje fiber, etc. The sinus node has a normal heart rate Pacemaker point , on Superior vena cava Entrance and Right auricle Between epicardium Below; The internodal bundle is between the sinoatrial node and the atrioventricular node Conduction pathway , divided into three bundles: anterior interknot bundle, middle interknot bundle and posterior interknot bundle Conduction bundle , in which the direction between anterior knots Left atrium Sending out branches is called room bundle. The atrioventricular node is located in Room partition right Endocardium Below, lying horizontally coronary sinus Mouth Oval fossa And the upper edge of the tricuspid septal valve, Extend Down It is atrioventricular bundle. Atrioventricular node and atrioventricular bundle (His bundle) Atrioventricular junction Area, and then extend forward and down to Interventricular septum Lower end, divided into left and right bundle branches, respectively located at Interventricular septum Below the left and right endocardium, the left bundle branch is located at the left beginning of the ventricular septum, and is divided into two bundles of fibers, the anterior and superior branches; The right bundle branch descends along the right side of the ventricular septum until the apex begins to branch into Purkinje fibers. The right bundle branch is connected to the Purkinje fiber network below the endocardium, and finally to the ventricular muscle.^[1]

Chinese name: Cardiac conduction system

Discipline: biology
Type: Biological terminology

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Cardiac conduction system function It is an impulse that is transmitted to all parts of the heart to make Atrial muscle And the ventricular muscles contract in a certain rhythm.

1） The conduction system of the heart Including sinoatrial node, atrioventricular node, atrioventricular bundle, left and right atrioventricular bundle branches and distribution to ventricles Papillary muscle And many fine branches of the ventricular wall.

2) Except for sinus node located at right atrium epicardium Deep, the rest are distributed in Endocardium lower stratum.

3) There are three types of special myocardial fibers that make up the heart conduction system: Pacemaker cells (Participation composition Sinoatrial node And atrioventricular node) Transitional cell (for impulse conduction) and Purkinje fiber (It can transmit impulses quickly).

4） Atrioventricular fasciculus The Purkinje fiber at the end of the branch is connected to the ventricular muscle.

5) Cardiac conduction Functions of the system It generates and transmits impulses to maintain the rhythmic beat of the heart.