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Middle Internodal Tract
Nervous System

Middle Internodal Tract

Fasciculus internodalis medius

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Quick Facts

Origin: Sinuatrial node.

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

Branches: None.

Supply: Autonomic innervation to the AV node.

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Origin

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

Course

The middle internodal tract runs down the medial surface of the right atrium towards the atrioventricular (AV) node.

Branches

The middle internodal tract runs to the AV node and has no named branches.

Supplied Structures & Function

The middle internodal tract serves 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.

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

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