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INTRODUCTION. The paranasal sinuses (âthe sinusesâ) are air-filled cavities located within the bones of the face and around the nasal cavity and eyes. Each sinus is named for the bone in which it is located: Physiology.
nasal sinus, paranasal sinus, sinus paranasales-any of the paired sinuses in the bones of the face adjacent to the nasal cavity that are lined with mucous membrane that is continuous with the lining of the nasal cavities. bodily cavity, cavum, cavity - (anatomy) a natural hollow or sinus within the body.