What is sinusitis?
By Dr Ananya Mandal, MD
What are sinuses?
The sinuses are hollow air filled cavities within the skull bones. There are four pars of sinuses and these are located behind the forehead (a pair), under the cheek bones (a pair), behind the eyes (a pair) and on either side of the bridge of the nose (a pair).
The sinuses are lined with a mucous membrane and function to humidify and warm the inhaled air before they can reach the lungs. The membranes within the sinuses contain tiny hairs called cilia. These move to allow movement of air and mucus within the sinuses and help remove foreign objects or microorganisms.
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