What is the primary role of the frontal sinuses?

The primary role of the frontal sinuses is to help lighten the weight of the skull. The frontal sinuses, located behind the forehead, are air-filled cavities that reduce the overall mass of the skull, making it easier for the head to be supported and moved. This reduction in weight is significant as it contributes to overall balance and agility.

In addition to weight reduction, these sinuses also play roles in resonance of the voice and the protection of the structures of the face and eyes by providing a buffering layer against trauma. However, the most direct and notable role is their contribution to the decreased weight of the skull. This anatomical adaptation allows for a stronger structure that is still lightweight, facilitating movement and function.