What are the irregular bands of tissue projecting from the inner surfaces of the ventricles called?

What are the irregular bands of tissue projecting from the inner surfaces of the ventricles called?

• A. Papillary muscles
• B. Trabeculae carneae
• C. Chordae tendineae
• D. Moderator band

Answer: (B)

Trabeculae carneae are irregular muscular ridges that line the inner walls of the ventricles. These bands stand off the endocardial surface and create a textured network, which helps prevent the walls from sticking together during contraction and increases the surface area for force transmission inside the ventricle. The other structures have different roles: papillary muscles are finger-like projections that anchor the valve leaflets via chordae tendineae; chordae tendineae are the tensile cords connecting valve leaflets to the papillary muscles; the moderator band is a specific muscular band in the right ventricle involved in conduction.

Trabeculae carneae are irregular muscular ridges that line the inner walls of the ventricles. These bands stand off the endocardial surface and create a textured network, which helps prevent the walls from sticking together during contraction and increases the surface area for force transmission inside the ventricle. The other structures have different roles: papillary muscles are finger-like projections that anchor the valve leaflets via chordae tendineae; chordae tendineae are the tensile cords connecting valve leaflets to the papillary muscles; the moderator band is a specific muscular band in the right ventricle involved in conduction.