Trabeculae carneae

The trabeculae carneae (columnae carneae, or meaty ridges), are rounded or irregular muscular columns which project from the inner surface of the right and left ventricle of the heart.wikipedia
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Ventricle (heart)

ventricleleft ventricleright ventricle
The trabeculae carneae (columnae carneae, or meaty ridges), are rounded or irregular muscular columns which project from the inner surface of the right and left ventricle of the heart.
On the inner walls of the ventricles are irregular muscular columns called trabeculae carneae which cover all of the inner ventricular surfaces except that of the conus arteriosus, in the right ventricle.

Heart

cardiachuman heartapex of the heart
The trabeculae carneae (columnae carneae, or meaty ridges), are rounded or irregular muscular columns which project from the inner surface of the right and left ventricle of the heart.
The walls of the right ventricle are lined with trabeculae carneae, ridges of cardiac muscle covered by endocardium.

Papillary muscle

papillary muscles
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.
*Trabeculae carneae

Pectinate muscles

pectinate muscleMusculi pectinati
These are different from the pectinate muscles, which are present in the atria of the heart.
Pectinate muscles of the atria are different from the trabeculae carneae which are found on the inner walls of both ventricles.

Trabecula

trabeculaetrabecular bonetrabecular
* Trabecula
In the heart, muscles form trabeculae carneae and septomarginal trabecula.

Atrium (heart)

right atriumatrialeft atrium
These are different from the pectinate muscles, which are present in the atria of the heart.

Chordae tendineae

chordae tendinaeTendon of Todarochord
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.

Mitral valve

mitralbicuspid valvemitral annulus
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.

Tricuspid valve

tricuspidtricuspid valvesheart
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.

Heart valve

heart valvesvalvesatrioventricular valves
By this action on the atrioventricular valves, backflow of the blood from the ventricles into the atria is prevented.

Bundle of His

crus of heartHis bundle
The moderator bands carry the right branch of the bundle of His and are part of the conducting system of the heart.