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Published on: April 8, 2013

Anterolateral muscle bundle of the left ventricle, bulboventricular flange and subaortic stenosis

A J Moulaert, A Oppenheimer-Dekker

    The American Journal of Cardiology
    |January 1, 1976
    PubMed

    Insights

    A newly identified muscle bundle in the left ventricle, present in 40% of normal hearts, may obstruct blood flow. This anterolateral muscle bundle is a potential remnant from embryonic development.

    Area of Science:

    • Cardiovascular Anatomy
    • Embryology
    • Cardiac Physiology

    Background:

    • The left ventricular outflow tract (LVOT) is critical for cardiac function.
    • Anatomical variations in the LVOT can impact hemodynamics.
    • Detailed understanding of cardiac muscle structures is essential for diagnosing potential pathologies.

    Purpose of the Study:

    • To describe a previously unrecognized muscle bundle in the LVOT.
    • To investigate the prevalence and potential functional significance of this muscle bundle.
    • To explore the embryological origins of the identified cardiac structure.

    Main Methods:

    • Anatomical dissection of human hearts.
    • Histological examination of cardiac tissue.
    • Embryological correlation and literature review.

    Main Results:

    • A distinct anterolateral muscle bundle was identified in the LVOT, situated between the left coronary aortic semilunar cusp and the anterior mitral leaflet.
    • This muscle bundle was present in approximately 40% of the examined normal hearts.
    • The muscle bundle's prominence can lead to obstruction in both the left ventricular inflow and outflow tracts.

    Conclusions:

    • The identified anterolateral muscle bundle represents a significant anatomical finding in the human heart.
    • Its presence, particularly when prominent, can cause left ventricular inflow and outflow obstruction.
    • Embryological evidence suggests this bundle is a remnant of the bulboatrioventricular flange, offering insights into cardiac development.

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