The maxillary sinus______________?
Correct answer: C. Has the 1st molar projecting into its floor
- A. Opens in to the inferior meatus of nose
- B. Is fully developed by the age of 8 years
- C. Has the 1st molar projecting into its floor
- D. Has good drainage in upright position
Explanation
The roots of the maxillary first molar commonly lie close to, or project into, the floor of the maxillary sinus. Its opening is into the middle meatus, and drainage is relatively poor because the opening is high on the sinus wall.
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