Which structure connects valve leaflets to the papillary muscles via tendinous cords?

Which structure connects valve leaflets to the papillary muscles via tendinous cords?

• A. Chordae tendinae
• B. Papillary muscle
• C. Pectinate muscle
• D. Tricuspid

Answer: (A)

Chordae tendineae are the string-like structures that connect the valve leaflets to the papillary muscles inside the ventricles. During ventricular contraction, the papillary muscles tense these cords to hold the leaflets closed and prevent them from bulging back into the atria, which stops backflow. If these cords were absent or damaged, the leaflets could prolapse and the valve wouldn’t seal properly, leading to regurgitation. The papillary muscles themselves are the muscle anchors for the cords, not the connecting structure. Pectinate muscles are muscular ridges in the atria with no role in tethering valve leaflets. Tricuspid refers to the valve itself, not the connective tissue that links leaflets to papillary muscles.

Chordae tendineae are the string-like structures that connect the valve leaflets to the papillary muscles inside the ventricles. During ventricular contraction, the papillary muscles tense these cords to hold the leaflets closed and prevent them from bulging back into the atria, which stops backflow. If these cords were absent or damaged, the leaflets could prolapse and the valve wouldn’t seal properly, leading to regurgitation.

The papillary muscles themselves are the muscle anchors for the cords, not the connecting structure. Pectinate muscles are muscular ridges in the atria with no role in tethering valve leaflets. Tricuspid refers to the valve itself, not the connective tissue that links leaflets to papillary muscles.