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Aperture of a frontal sinus

Aperture of a frontal sinus [apertura sinus frontalis – PNA (The anatomic nomenclature Parisian), JNA (The anatomic nomenclature Yenskaya)] – the pair opening located on a nasal part of a frontal bone (the lower surface). The aperture of a frontal sinus reports the average nasal course with a frontal sinus.

 
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