Nasofrontal duct
Encyclopedia
The nasofrontal duct is a duct connecting the infundibulum
Infundibulum
An infundibulum is a funnel-shaped cavity or organ.* Lungs: The alveolar sacs of the lungs from which the air chambers open are called infundibula...

 and frontal sinus
Frontal sinus
Sinuses are mucosa-lined airspaces within the bones of the face and skull. The frontal sinuses, situated behind the superciliary arches, are absent at birth, but are generally fairly well developed between the seventh and eighth years, only reaching their full size after puberty...

.

A true nasofrontal duct only exists in 15% of the population.

Some sources prefer the term "frontal recess".
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