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Reference.org
Paranasal sinuses
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<p>Paranasal sinuses are a group of four paired <a href="/facts/Skeletal_pneumaticity/A3uxJQyv">air-filled spaces</a> that surround the <a href="/facts/Nasal_cavity/N82Yw4LR">nasal cavity</a>. The <a href="/facts/Maxillary_sinus/yTuFjGkp">maxillary sinuses</a> are located under the <a href="/facts/Eye/h3lbYU55">eyes</a>; the <a href="/facts/Frontal_sinus/aSl4ym62">frontal sinuses</a> are above the eyes; the <a href="/facts/Ethmoid_sinus/vvkP4j8m">ethmoidal sinuses</a> are between the eyes and the <a href="/facts/Sphenoidal_sinus/EFYs15eT">sphenoidal sinuses</a> are behind the eyes. The <a href="/facts/Sinus_(anatomy)/TdjefDG0">sinuses</a> are named for the <a href="/facts/Facial_skeleton/dALEo94L">facial bones and sphenoid bone</a> in which they are located. Their role is disputed. </p>