Which of the following structures does NOT open into the middle meatus? A) Frontal sinus B) Posterior ethmoidal sinus C) Maxillary sinus D) Sphenoid sinus
Understand the Problem
The question is asking which structure among the listed options does not drain into the middle meatus of the nasal cavity. The answer requires knowledge of the anatomy of the paranasal sinuses and their drainage pathways.
Answer
Posterior ethmoidal sinus
The posterior ethmoidal sinus does not open into the middle meatus.
Answer for screen readers
The posterior ethmoidal sinus does not open into the middle meatus.
More Information
The posterior ethmoidal sinus drains into the superior meatus, unlike the frontal, anterior ethmoidal, and maxillary sinuses, which drain into the middle meatus.
Tips
A common mistake is thinking all ethmoidal sinuses drain into the same meatus. Remember that the posterior drainage is different.
Sources
- The following paranasal sinuses drain into the middle meatus except - homework.study.com
- Paranasal Sinus Anatomy - Medscape Reference - emedicine.medscape.com
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