Which duct carries frontal sinus drainage toward the middle meatus?

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Frontal sinus secretions reach the nasal cavity through a dedicated channel that directly connects the frontal sinus to the middle meatus. This conduit is the frontonasal duct, which opens into the middle meatus near the hiatus semilunaris, guiding frontal sinus drainage into the nasal cavity. The infundibulum is more involved with drainage pathways from the maxillary sinus and ethmoid air cells into the middle meatus, not the frontal sinus. The nasolacrimal duct carries tears to the inferior meatus, and the sphenoethmoidal recess houses the sphenoid sinus opening. So the frontonasal duct is the route by which frontal sinus drainage reaches the middle meatus.