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Anterior Internodal Tract
Nervous System

Anterior Internodal Tract

Fasciculus internodalis anterior

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Quick Facts

Origin: Sinuatrial node.

Course: Along the anterior surface of the right atrium towards the AV node.

Branches: Bachmann’s bundle to the left atrium.

Supply: Autonomic innervation to the atria and AV node.

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Origin

The anterior internodal tract emerges from the anterior surface of the sinuatrial (SA) node.

Course

The anterior internodal tract runs down the anterior surface of the right atrium towards the atrioventricular (AV) node. Along its way it sends a prominent branch to the left atrium (Bachmann’s bundle).

Branches

The anterior internodal tract runs to the AV node. The only major branch, Bachmann’s bundle, emerges from the tract, crosses the interatrial septum to the left atrium, thus connecting both atria (not shown in 3D model) (Dorland, 2011).

Supplied Structures & Function

The anterior internodal tract serves to propagate the SA node action potential to the tissues of the right and left atria. Additionally, it acts with the other internodal tracts to transmit the SA node action potential to the AV node at the base of the right atrium (Katz, 2010, Anderson et al., 2009).

References

Anderson, R. H., Yanni, J., Boyett, M. R., Chandler, N. J. and Dobrzynski, H. (2009) 'The anatomy of the cardiac conduction system', Clin Anat, 22(1), pp. 99-113.

Dorland, W. A. (2011) Dorland's Illustrated Medical Dictionary. 32nd edn.

Katz, A. M. (2010) Physiology of the Heart. M - Medicine Series: Wolters Kluwer Health/Lippincott Williams & Wilkins Health.

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