Michael asks…Regarding content of middle meatus,the infundibulum is always the opening of frontal sinus?2)At semilunaris hiatus,there is ONLY the opening for maxillary sinus?Will openings for ethmoidal sinus found at semilunaris hiatus?Mary Wei answers:1. The infundibulum leads into the frontal sinus.
The infundibulum is a funnel shaped opening at the anterosuperior aspect of the middle meatus. It leads into the frontal sinus.
Positioned on the lateral wall of the middle meatus, the
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