Which of the following structures is shaped like a pyramid and rests on top of the cricoid cartilage?

The structure shaped like a pyramid that rests on top of the cricoid cartilage is the arytenoid cartilages. These paired cartilages play a crucial role in voice production by controlling the tension and position of the vocal cords, which are essential for phonation. The pyramid-like shape allows for a range of movement, enabling the arytenoids to facilitate abduction and adduction of the vocal cords during speech and breathing.

The arytenoid cartilages sit on the posterior portion of the cricoid cartilage and articulate with it, allowing them to pivot and slide. This mobility is vital for adjusting the airway during breathing and optimizing sound production when speaking or singing.