Question

What are the irregular muscular ridges on the inner surface of the heart's ventricles called?

• A. Trabeculae septomarginalis
• B. Papillary muscles
• C. Columnae carneae
• D. Chordae tendineae

Hint:

Columnae carneae are muscular ridges in the ventricles that help strengthen contraction and maintain efficient blood flow during ventricular pumping.

Answer 1

The Correct Option is C

Concept: The ventricles of the heart contain specialized muscular structures that help maintain efficient blood flow and prevent the collapse of the ventricular walls during contraction. These internal structures include papillary muscles, chordae tendineae, and irregular muscular ridges known as columnae carneae.

Step 1: Understanding ventricular anatomy.
The inner walls of the ventricles are not smooth. Instead, they possess numerous irregular muscular elevations. These ridges increase the strength of contraction and prevent the ventricular walls from sticking together during systole.

Step 2: Identification of the structures.

• Columnae carneae: Irregular muscular ridges present on the inner ventricular walls.
• Papillary muscles: Muscles attached to chordae tendineae that help control valve movement.
• Chordae tendineae: Tendinous cords connecting papillary muscles to atrioventricular valves.
• Trabeculae septomarginalis: A specific muscular band found in the right ventricle.

Step 3: Conclusion.
Therefore, the irregular muscular ridges present on the inner surface of the ventricles are called columnae carneae.