Papillary muscles
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At the time the article was created Craig Hacking had no recorded disclosures.
View Craig Hacking's current disclosuresAt the time the article was last revised Yuranga Weerakkody had no recorded disclosures.
View Yuranga Weerakkody's current disclosures- Papillary muscle
The papillary muscles are thick bands and ridges of endocardial-lined myocardium that project into the lumen of the cardiac ventricles. They essentially represent dominant ventricular trabeculae which attach to the cusps of the atrioventricular valves via the chordae tendineae. During systole, they contract to close atrioventricular valves and prevent the valves from prolapsing.
The right ventricle has 3 papillary muscles that attach to the cusps of the tricuspid valve:
- the anterior papillary muscle attaches to the chordae tendineae of the anterior and posterior cusps
- the posterior papillary muscle attaches to the chordae tendineae of the posterior and septal cusps
- the septal papillary muscle attaches to the chordae tendineae of the anterior and septal cusps
Within the anterior papillary muscle, there is a prominent band that extends from the interventricular septum that contains the right bundle branch, known as the septomarginal trabecula or moderator band.
The left ventricle has 2 papillary muscles that attach to the cusps of the mitral valve:
- anterior papillary muscle attaches to the chordae tendineae of the anterior and posterior cusps
- posterior papillary muscle attaches to the chordae tendineae of the anterior and posterior cusps
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Related pathology
References
- 1. Last's anatomy, regional and applied. Churchill Livingstone. ISBN:044304662X. Read it at Google Books - Find it at Amazon
- 2. Moore KL, Agur AMR, Dalley AF. Clinically oriented anatomy. LWW. ISBN:1451119453. Read it at Google Books - Find it at Amazon
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- Mitral valve regurgitation
- End-diastolic volume
- Mitral annular disjunction
- Congenital heart disease in echocardiography (an approach)
- Fabry disease (cardiac manifestations)
- Cardiac segmentation model
- Coarctation of the aorta
- Left ventricle
- Blunt cardiac injury
- Chordae tendineae
- Transcatheter mitral valve intervention
- End-systolic volume
- Papillary muscle calcification
- Tricuspid valve
- Arrhythmic mitral valve prolapse
- Papillary muscle rupture
- Transthoracic echocardiography
- Cardiac valves
- Right ventricle
- Development of the heart
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