Origin And Spread Of Cardiac Impulse

Origin And Spread Of Cardiac Impulse

Explain origin and spread of cardiac impulse.
Answer:

• The conducting system of the heart is responsible for the origin and spread of cardiac impulse.

Origin of impulse:

• Cardiac impulses are generated in the pacemaker which is sino-atrial node i.e., SA Node.
• SA node is situated in right-atrium just below the opening of superior vena cava.

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Spread of impulse:

• Impulses is spread from SA node to AV nodes first through internodal pathway.
• This includes.
  • Anterior internodal fibers of bachman.
  • Middle internodal fibers of wenkebach.
  • Posterior internodal fibers of thorel.

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• All these fibers from SA node converge on AV node.
• From here, the impulse are spread through conductive system of heart.
• It comprises of
  1. AV node
  2. Bundle of his
  3. Right and left bundle branches
  4. Purkinje fibers.

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