The sphenoid sinus is a small, air-filled cavity located deep within the skull, specifically in the sphenoid bone. It plays a vital role in the respiratory system by producing mucus that helps moisturize and clean the nasal passages. Additionally, the sphenoid sinus contributes to the reduction of the skull's weight and acts as a buffer between the brain and the nasal cavity. Its anatomical position and function make it an essential component of the overall sinus system.

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