Chordae tendincae are the fibrous cords attached with:

Explanation

The chordae tendineae are fibrous cords that attach the flaps of the tricuspid valve to the papillary muscles in the right ventricle of the heart. They help to keep the flaps of the valve closed during ventricular contraction, preventing blood from flowing back into the right atrium. The chordae tendineae are made up of collagen and elastin fibers. They are strong and elastic, which allows them to stretch and contract as the heart beats. The chordae tendineae are important for the proper functioning of the tricuspid valve. If the chordae tendineae are damaged or weakened, the flaps of the valve may not close properly, which can lead to blood flow back into the right atrium. This can cause a condition called tricuspid regurgitation.