Posterior ethmoid sinus opens into which nasal meatus?

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Multiple Choice

Posterior ethmoid sinus opens into which nasal meatus?

Explanation:
Draining patterns of the paranasal sinuses align with the vertical arrangement of the meatuses. The posterior ethmoid air cells sit high in the ethmoid labyrinth and send their openings into the superior nasal meatus. In contrast, the anterior and middle ethmoid cells drain into the middle meatus, and the sphenoid sinus drains into the sphenoethmoidal recess above the superior meatus. So the posterior ethmoid sinuses open into the superior meatus.

Draining patterns of the paranasal sinuses align with the vertical arrangement of the meatuses. The posterior ethmoid air cells sit high in the ethmoid labyrinth and send their openings into the superior nasal meatus. In contrast, the anterior and middle ethmoid cells drain into the middle meatus, and the sphenoid sinus drains into the sphenoethmoidal recess above the superior meatus. So the posterior ethmoid sinuses open into the superior meatus.

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