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Question: 1 / 400

What are the three internodal tracts that originate from the SA node and terminate in the AV node?

Superior, Middle, Inferior

Anterior, Middle, Posterior

The correct answer identifies the three internodal tracts that connect the sinoatrial (SA) node to the atrioventricular (AV) node in the heart's conduction system. These tracts are known as the anterior, middle, and posterior internodal pathways.

The anterior tract, which is also referred to as Bachmann's bundle, primarily conducts impulses from the SA node to the left atrium. The middle tract transmits signals to the AV node while working in conjunction with both the anterior and posterior tracts. The posterior internodal tract assists in conducting the impulses more efficiently through the right atrium to the AV node.

Understanding these pathways is crucial for grasping how signals move through the heart, facilitating synchronized contractions. This knowledge is particularly important in clinical settings when diagnosing arrhythmias or other conduction abnormalities.

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Right, Left, Central

Short, Long, Intermediate

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