Cardiac Conduction System

Cardiac Conduction System

Specialized junction tissues of heart.
Answer:

Synonym:

• Conductive tissues.

Junctional tissues of heart:

• It comprises of

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1. AV node:

Location:

• Posteriorly on right side of the interatrial septum near the opening of coronary sinus.

Nerve supply:

• It is supplied by left vagus nerve and sympathetic nerve supply.

2. Internodal atrial pathways:

• They arise from SA node and converge on AV node.
• They conduct impulses from SA node to AV node.
• They are arranged as
  1. Anterior internodal fibers of bachman.
  2. Middle internodal fibers of wenckebach.
  3. Posterior internodal fibers of thorel.

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3. Bundle of his:

• Arises from AV node.
• Runs upwards to the posterior margin of the membranous interventicular system.
• Then it runs forward below it.

4. Right and left bundle branches:

• They are branches of bundle of His.
  1. Left branch.
     • Divides into anterior and posterior fascicle.
  2. Right branch.
     • Passes down the right side of the septum.

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5. Purkinje fibres:

• They arise from branches of bundle of His.
• Penetrate the ventricular wall.
• Transmit impulse at a fast velocity.

“Factors influencing success with cardiac conduction system studies: Q&A”