The maxillary sinus drains into which nasal meatus?

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The maxillary sinus drains into the middle nasal meatus. Its ostium is located high on the medial wall of the sinus and opens into the middle meatus at the hiatus semilunaris (semilunar hiatus). This route places drainage into the middle meatus, rather than the other meatuses or recesses. The inferior meatus receives drainage from the nasolacrimal duct, not the maxillary sinus. The superior meatus mainly collects drainage from the posterior ethmoid air cells (and the sphenoid sinus drains into the sphenoethmoidal recess). Obstruction of the ostiomeatal complex in this area can impede maxillary sinus drainage and contribute to sinusitis.