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Valve cusps are tethered to papillary muscles by the:

AChorda dorsalis
BChordal terminals
CChordate tendons
DChordae tendineae
Answer & Solution
Correct answer: D. Chordae tendineae
1. The cusps must not flip backwards. 2. Thin cords hold them down. 3. Those cords are the chordae tendineae. _Source: OpenStax Anatomy and Physiology 2e, Chapter 19, The Cardiovascular System: The Heart._
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