Sinusitis is inflammation of the mucous tissues lining the air-filled spaces called the paranasal sinuses. The sinuses are complicated, divided airways and drainage pathways situated at the area of the nose and belong to an area known as the upper respiratory tract. Humans possess four paranasal sinuses: the maxillary, frontal, ethmoid, and sphenoid. A thin layer covering the sinuses is made of a mucus…
Table of Contents
