4. Circulatory and Respiratory system

Paranasal sinuses

Paranasal sinuses (Sinus paranasales); Image: Begoña Rodriguez

Paranasal sinusesSinus paranasales1/5

Several bones that form the walls of the nasal cavity contain air-filled spaces called the paranasal sinuses, which are named after their associated bones; maxillaryfrontalsphenoidal and ethmoidal sinuses.

The paranasal sinuses communicate with the nasal cavity via several openings, and thereby also receive the inhaled air and contribute to its humidifying and warming. In addition, the mucous membrane and respiratory epithelium that lines both the nasal cavity and the paranasal sinuses traps any harmful particles, dust or bacteria.

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