# Paranasal Sinuses --- The **paranasal sinuses** are cavities located within the bones of the [[skull]] that are associated with the [[nose]]. They serve three main functions: - They **keep the air in the nasal cavities moist and warm**. - They **keep the bones of the skull lighter** than they would be without them. - They **provide resonance for your voice**. ![[sinuses.png]] There are four pairs of sinuses: - frontal - maxillary - ethmoidal - sphenoidal ___