Frontal sinus drains into which region of the nasal cavity?

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Frontal sinus drainage goes into the middle region of the nasal cavity. The frontal sinus empties through the frontonasal duct into the middle meatus, opening near the hiatus semilunaris (the curved groove in the middle meatus that serves as a common drainage pathway). This makes the middle meatus the collecting site for frontal sinus secretions, along with drainage from the maxillary sinus and anterior ethmoid air cells. By contrast, the sphenoid sinus drains upward into the sphenoethmoidal recess, the posterior ethmoid cells drain into the superior meatus, and the nasolacrimal duct drains into the inferior meatus.