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Left Bundle Branch of Atrioventricular Bundle
Nervous System

Left Bundle Branch of Atrioventricular Bundle

Crus sinistrum fasciculi atrioventricularis

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Quick Facts

Origin: AV Bundle.

Course: Inferiorly along the left ventricular surface of the interventricular septum.

Branches: Left subendocardial branches (or Purkinje fibers).

Supply: Action potential to initiate contraction of the left ventricular myocardium.

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Origin

The left 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 left 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 left ventricle.

Branches

The left bundle of the AV bundle terminates as subendocardial branches or Purkinje fibers that are distributed throughout the left ventricle.

Supplied Structures & Function

The left 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 left 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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