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Anterior papillary muscle

The anterior papillary muscles are prominent muscular projections within the ventricles of the heart that attach to the atrioventricular valves via chordae tendineae. Both the right ventricle and the left ventricle contain an anterior papillary muscle, each contributing to proper valve function and unidirectional blood flow.

  • In the right ventricle, the anterior papillary muscle is the largest and most prominent papillary muscle, arising from the anterior ventricular wall near the moderator band (septomarginal trabecula). It sends chordae tendineae to the anterior and posterior cusps of the tricuspid valve, stabilizing them during systole.

  • In the left ventricle, the anterior papillary muscle arises from the anterolateral wall and attaches via chordae tendineae to the anterior and posterior leaflets of the mitral valve. It usually works together with the posterior papillary muscle to maintain mitral valve competence.

Both anterior papillary muscles are critical for valve stability. Dysfunction caused by ischemia, infarction, rupture, or congenital anomalies can result in tricuspid regurgitation (right-sided) or mitral regurgitation (left-sided), leading to impaired cardiac function and heart failure.

Synonyms

  • Right ventricular anterior papillary muscle (tricuspid valve)

  • Left ventricular anterior papillary muscle (anterolateral papillary muscle of mitral valve)

  • Papillaris anterior

Function

  • Right anterior papillary muscle (RV): stabilizes anterior and posterior cusps of tricuspid valve during systole

  • Left anterior papillary muscle (LV): stabilizes anterior and posterior leaflets of mitral valve

  • Prevent valve prolapse into atria during systole

  • Maintain unidirectional flow (RA → RV → pulmonary artery; LA → LV → aorta)

  • Coordinate contraction with ventricular myocardium and septum

MRI Appearance

T1-weighted images:

  • Papillary muscles appear as intermediate signal intensity similar to ventricular myocardium

  • Surrounded by blood pool, which appears as a signal void

T2-weighted images:

  • Normally intermediate to low signal relative to myocardium

  • Pathological changes (ischemia, infarction, myocarditis) may show hyperintense signal

STIR (Short Tau Inversion Recovery):

  • Suppresses fat and highlights myocardial edema or inflammation

  • Papillary muscle edema appears as bright hyperintense signal

T1 Post-Contrast (Gadolinium-enhanced):

  • Normal papillary muscles show homogeneous enhancement similar to myocardium

  • Delayed enhancement indicates fibrosis, infarction, or scarring

MRI Non-Contrast Cardiac-Gated 3D Coronary Imaging:

  • Anterior papillary muscles can be seen as well-defined muscular projections into the ventricular cavities

  • Useful for assessing papillary muscle morphology, displacement, or hypertrophy

CT Appearance

CT Coronary Angiography (CCTA):

  • Papillary muscles visualized as soft tissue density projections into the ventricular lumen

  • Excellent spatial resolution for assessing papillary muscle morphology, hypertrophy, or rupture

  • Useful in evaluation of mitral valve disease, tricuspid valve disease, or post-infarct complications

CT images Left

Anterior papillary muscle of ventricle anatomy CT axial image -img-00000-00000

CT images Left

Anterior papillary muscle of ventricle anatomy CT axial image -img-00000-00000_00001

MRI image

Anterior papillary muscle of left ventricle mri axial image

CT image Right

Anterior papillary muscle of ventricle anatomy CT axial image -img-00000-00000_00002