A sinus refers to a hollow space or cavity within a bone or tissue. Sinuses are typically lined with a mucous membrane and can be found in various locations, such as the skull, nasal passages, and facial bones. They serve several functions, including reducing the weight of the skull, enhancing voice resonance, producing mucus, and helping to regulate air pressure and temperature. Sinuses are prone to inflammation and can contribute to conditions such as sinusitis when their normal drainage becomes blocked.

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