Papillary muscle
Interior of right side of heart. Papillary muscles labeled in purple.
Diagram showing relations of opened heart to front of thoracic wall. Ant. Anterior segment of tricuspid valve. A O. Aorta. A.P. Anterior papillary muscle. In. Brachiocephalic artery (Innominate). L.C.C. Left common carotid artery. L.S. Left subclavian artery. L.V. Left ventricle. P.A. Pulmonary artery. R.A. Right atrium. R.V. Right ventricle. V.S. Ventricular septum.
Latin	musculus papillaris
Gray's	subject #138 532

In anatomy, the papillary muscles of the heart serve to limit the movements of the mitral and tricuspid valves. These muscles contract to tighten the chordae tendineae, which in turn prevent inversion. This occurs in response to pressure gradients. Instead they brace the valves against the high pressure, preventing regurgitation of ventricular blood back into the atrial cavities.

[edit] Additional images

Section of the heart showing the ventricular septum.

Schematic representation of the atrioventricular bundle of His.

Heart normal short axis echo

Heart short axis view papillary

[edit] External links

• papillary+muscle at eMedicine Dictionary
• SUNY Labs 20:19-0106 - "Heart: The Right Atrioventricular (Tricupsid) Valve" (anterior, posterior, septal papillary muscles)
• SUNY Labs 20:26-0105 - "Heart: The Left Atrioventricular (Mitral) Valve" (anterior, posterior papillary muscles)
• -1368719301 at GPnotebook
• Bioweb at UWLAX Human heart model (left internal anatomy)
• Atlas of anatomy at UMich ht_rt_vent - "Right atrioventricular bundle branch, anterior view"
• Definition of Papillary muscle
• MedicineNet Search Results

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