What are the divisions of each valve cusp referred to as?

The correct answer relates to the anatomical features of heart valves, specifically referencing the locations where the cusps of the valves meet. The divisions of each valve cusp are referred to as commissures. This term describes the points of attachment where adjacent valve leaflets or cusps come together.

Understanding this anatomy is crucial for perfusionists as they work with heart valve mechanics during various procedures, including surgeries involving valve repair or replacement. The commissures play an essential role in ensuring proper valve function and preventing issues such as regurgitation.

In contrast to the other terms provided, struts typically refer to supportive structures within the frame of prosthetic valves, while chordae are the tendinous cords that anchor the valve leaflets to the papillary muscles, helping to maintain proper closure during the cardiac cycle. Leaflets, on the other hand, are the main components of the valve itself, but do not describe the specific divisions of the cusps.