Which muscle is known as the "cheek muscle" that assists in chewing?

The buccinator is recognized as the "cheek muscle" due to its location and function in the oral cavity. This muscle is situated within the wall of the cheek and plays a crucial role in the process of chewing (mastication). It helps to keep the food between the teeth while chewing, ensuring efficient movement of food and minimizing the risk of it getting trapped between the teeth and the gums. The buccinator also aids in actions such as blowing and sucking, providing additional support during oral and facial movements.

In contrast, the orbicularis oris is primarily responsible for movements of the lips, influencing actions such as puckering and closing the mouth, but does not have a significant role in chewing itself. The frontalis is involved in elevating the eyebrow and wrinkle formation on the forehead, and does not contribute to chewing or the movements of the cheek. The zygomaticus minor, while involved in facial expressions such as smiling, does not assist in the mastication process as the buccinator does.

Thus, the buccinator's role in maintaining food positioning and facilitating chewing motions is what makes it the correct answer in this context.