Paranasal sinuses the paranasal sinuses are air cavities that help circulate the air that is breathed in and out of the respiratory system they are situated around the nasal cavity and they are all paired and sometimes symmetrical while always being bilateral. Maxillary sinus within the maxillary bones the largest among all the paranasal sinuses 2 these two conical cavities are located on the two sides of the nose above the upper teeth and below the cheeks 4. The paranasal sinuses are air filled extensions of the respiratory part of the nasal cavity there are four paired sinuses named according to the bone in which they are located maxillary frontal sphenoid and ethmoid. The paranasal sinus region is one of the most complex areas of the human body and is consequently very diffi cult to study the surgical anatomy of the nose and
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