Papillary muscle

papillary muscles
The papillary muscles are muscles located in the ventricles of the heart.wikipedia
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Heart valve

heart valvesvalvesatrioventricular valves
They attach to the cusps of the atrioventricular valves (also known as the mitral and tricuspid valves) via the chordae tendineae and contract to prevent inversion or prolapse of these valves on systole (or ventricular contraction).
The chordae tendineae are attached to papillary muscles that cause tension to better hold the valve.

Chordae tendineae

chordae tendinaetendon of Todarochord
They attach to the cusps of the atrioventricular valves (also known as the mitral and tricuspid valves) via the chordae tendineae and contract to prevent inversion or prolapse of these valves on systole (or ventricular contraction).
The chordae tendineae (tendinous cords), colloquially known as the heart strings, are tendon-resembling fibrous cords of connective tissue that connect the papillary muscles to the tricuspid valve and the bicuspid valve in the heart.

Tricuspid valve

tricuspidtricuspid valvesheart
They attach to the cusps of the atrioventricular valves (also known as the mitral and tricuspid valves) via the chordae tendineae and contract to prevent inversion or prolapse of these valves on systole (or ventricular contraction).
Each leaflet is connected via chordae tendineae to the anterior, posterior, and septal papillary muscles of the right ventricle, respectively.

Mitral valve

mitralbicuspid valvemitral annulus
They attach to the cusps of the atrioventricular valves (also known as the mitral and tricuspid valves) via the chordae tendineae and contract to prevent inversion or prolapse of these valves on systole (or ventricular contraction).
The chordae tendineae are inelastic tendons attached at one end to papillary muscles in the left ventricle, and at the other to the valve cusps.

Systole

systolicsystolic pressureventricular systole
They attach to the cusps of the atrioventricular valves (also known as the mitral and tricuspid valves) via the chordae tendineae and contract to prevent inversion or prolapse of these valves on systole (or ventricular contraction).
Ventricular systole induces self-contraction such that pressure in both left and right ventricles rises to a level above that in the two atrial chambers, thereby closing the tricuspid and mitral valves—which are prevented from inverting by the chordae tendineae and the papillary muscles.

Left anterior descending artery

anterior interventricularleft anterior descendingleft anterior descending coronary artery
Anterolateral muscle blood supply: left anterior descending artery - diagonal branch (LAD) and left circumflex artery - obtuse marginal branch (LCX)
Diagonals run along the surface of the heart and supply the lateral wall of the left ventricle and the anterolateral papillary muscle.

Mitral insufficiency

mitral regurgitationmitral valve diseasemitral valve regurgitation
Both complications may lead to worsening of mitral regurgitation.
Cardiovascular collapse with shock (cardiogenic shock) may be seen in individuals with acute MR due to papillary muscle rupture, rupture of a chorda tendinea or infective endocarditis of the mitral valve.

Right coronary artery

right coronaryright coronary arteriescoronary arteries
Posteromedial muscle blood supply: right coronary artery - posterior interventricular artery (RCA)
The PDA supplies the inferior wall, ventricular septum, and the posteromedial papillary muscle.

Heart

cardiachuman heartapex of the heart
The papillary muscles extend from the walls of the heart to valves by cartilaginous connections called chordae tendinae.

Circumflex branch of left coronary artery

left circumflex arterycircumflex branchcircumflex artery
Anterolateral muscle blood supply: left anterior descending artery - diagonal branch (LAD) and left circumflex artery - obtuse marginal branch (LCX)
The LCX supplies the posterolateral left ventricle and the anterolateral papillary muscle.

Trabeculae carneae

*Trabeculae carneae
The trabeculae carneae also serve a function similar to that of papillary muscles in that their contraction pulls on the chordae tendineae, preventing inversion of the mitral (bicuspid) and tricuspid valves towards the atrial chambers, which would lead to subsequent leakage of the blood into the atria.

Ventricle (heart)

ventricleleft ventricleright ventricle
The third type, the papillary muscles give origin at their apices to the chordae tendinae which attach to the cusps of the tricuspid valve and to the mitral valve.

Prolapse

prolapsed uterusprolapsingrectal prolapse
They attach to the cusps of the atrioventricular valves (also known as the mitral and tricuspid valves) via the chordae tendineae and contract to prevent inversion or prolapse of these valves on systole (or ventricular contraction).

Posterior interventricular artery

posterior descendingposterior descending artery
Posteromedial muscle blood supply: right coronary artery - posterior interventricular artery (RCA)

Cardiac cycle

heartbeatheart beatventricular systole
The papillary muscles of both the right and left ventricles begin to contract shortly before ventricular systole and maintain tension throughout.

Myocardial infarction

heart attackheart attacksacute myocardial infarction
Papillary muscle rupture can be caused by a myocardial infarct, and dysfunction can be caused by ischemia.

Ischemia

ischemicischaemiaischaemic
Papillary muscle rupture can be caused by a myocardial infarct, and dysfunction can be caused by ischemia.

Brachiocephalic artery

brachiocephalic trunkinnominate arterybrachiocephalic

Pulmonary artery

pulmonary arteriespulmonary trunkpulmonary