In slightly over 50 % of subjects, this is directly continuous with the frontonasal duct from the frontal air sinus.
2.
When the anterior end of the uncinate process fuses with the front part of the bulla, however, this continuity is interrupted and the frontonasal duct then drains directly into the anterior end of the middle meatus.
3.
It consists of a thin infundibulum, extends upward and forward through the labyrinth and communicates with the anterior ethmoidal cells, and in about 50 % of skulls is continued upward as the frontonasal duct into the frontal sinus.
4.
Through the hiatus semilunaris the meatus communicates with a curved passage termed the infundibulum, which communicates in front with the anterior ethmoidal cells and in rather more than fifty percent of skulls is continued upward as the frontonasal duct into the frontal air-sinus; when this continuity fails, the frontonasal duct opens directly into the anterior part of the meatus.
5.
Through the hiatus semilunaris the meatus communicates with a curved passage termed the infundibulum, which communicates in front with the anterior ethmoidal cells and in rather more than fifty percent of skulls is continued upward as the frontonasal duct into the frontal air-sinus; when this continuity fails, the frontonasal duct opens directly into the anterior part of the meatus.
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