Paranasal Sinuses
Paranasal sinus are group of four paired air- filled cavities( sac) that surrounds nasal cavity.
1. Frontal sinuses - above the eyes
2. Ethmoidal sinuses - between the eyes
3. Sphenoidal sinuses - behind the eyes
4. Maxillary sinuses - located under eyes
Sinuses are lined with mucus membrane.
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