Q:

What are the names of the major paranasal sinuses?

A:

Quick Answer

The four paranasal sinuses are the maxillary, sphenoid, frontal and ethmoid sinuses, states Medscape. Located in the skull, these compartments are completely filled with air.

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Full Answer

The four paranasal sinuses are all centered around the nasal cavity, notes Medscape. Their function is to humidify the air that humans breathe and heat it so that the nasal passages and airways stay clear of debris. They also lighten the total weight of the head, increase the resonance of the human speech and protect the face from trauma by serving as a crumple zone during any facial injuries. The maxillary sinus is located below the eyes, the frontal sinus is above the eyes, the ethmoid sinuses lie between the eyes, and the sphenoid sinus lies behind the nasal cavity.

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