Right Bundle Branch of Atrioventricular Bundle
Crus dextrum fasciuli atrioventricularis
Read moreQuick Facts
Origin: AV Bundle.
Course: Inferiorly along the right ventricular surface of the interventricular septum.
Branches: Right subendocardial branches (or Purkinje fibers).
Supply: Action potential to initiate contraction of the left ventricular myocardium.
Origin
The right bundle (or branches) of the atrioventricular (AV) bundle originates in the interventricular septum, just inferior to the central fibrous body where the AV bundle splits into right and left branches.
Course
The right bundle of the AV bundle runs down the wall of the interventricular septum towards the apex of the heart. It is found just deep to the endocardium lining the left ventricular surface of the septum. Upon reaching the apex, fibers will continue up superiorly along the lateral walls of the right ventricle.
Branches
There right bundle of the AV bundle terminates as subendocardial branches or Purkinje fibers that are distributed throughout the right ventricle. A significant number of branches travel across the right ventricle in the septomarginal trabecula moderator band (or moderator band), short-cutting their way to the papillary muscles.
Supplied Structures & Function
The right bundle of the AV bundle propagates the action potential passed to it from the AV bundle, transmitting it to the Purkinje fibers lining the inner surface of the right ventricular myocardium (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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Bundle of His
The atrioventricular (AV) bundle (of His) is a collection of specialized muscle fibers beginning at the AV node and dividing into right and left bundles at the junction of the membranous and muscular parts of the interventricular septum.
