Drainage from the frontal paranasal sinus empties into the_______________?
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Answer: B. Middle meatus
Explanation
The frontal paranasal sinus drains into the middle meatus of nose. This drainage pathway passes through the frontonasal duct and hiatus. Mucus flows out of the sinus into the nasal cavity continuously. Paranasal sinuses are air filled spaces within bones surrounding nasal cavity. The middle meatus is a passage beneath the middle nasal concha. Ciliated epithelium sweeps mucus toward the natural sinus ostia openings.
Sinusitis causes inflammation and blockage of these narrow drainage pathways. Functional endoscopic sinus surgery aims to widen these drainage openings. Blocked frontal sinus ostia lead to painful pressure in the forehead. The superior meatus receives drainage from the posterior ethmoidal sinuses. The inferior meatus receives the opening of the nasolacrimal duct. The sphenoethmoidal recess receives the opening of the sphenoidal sinus.
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