The frontal paranasal sinus drains into the_______________?
Correct answer: B. Middle meatus
- A. Superior meatus
- B. Middle meatus
- C. Inferior meathus
- D. Spheno- ethmoidal recess
Explanation
The frontal sinus drains through the frontonasal duct into the ethmoidal infundibulum and then the middle meatus. The superior meatus mainly receives posterior ethmoidal air cells, while the sphenoethmoidal recess receives the sphenoid sinus.
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