Impulses from SA node to the left atrium and AV node passes through:
Correct Answer: Bachmann bundle
Description: There are three bundles of atrial fibers that contain Purkinje-type fibers and connect the SA node to the AV node: the anterior, middle (tract of Wenckebach), and posterior (tract of Thorel) tracts.
Bachmann bundle is sometimes used to identify a branch of the anterior internodal tract that connects the right and left atria.
Key Concept
3 INTERNODAL TRACTS:
Connects SA node to AV node:
Anterior – Bachman’s bundle
Middle – Wenckebach’s bundle
Posterior – Thorel’s bundle
Reference: Ganong’s Review of Medical Physiology T W E N T Y - F I F T H E D I T I O N page no 519
Category:
Physiology
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