Where does each frontal sinus open?
Answer: Middle meatus of the nasal cavity, either through ethmoidal infundibulum or directly via frontonasal duct.
Where does each frontal sinus open?
Answer: Middle meatus of the nasal cavity, either through ethmoidal infundibulum or directly via frontonasal duct.
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.