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.
Related parts of the anatomy
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.
