ethmoidal infundibulum ethmoidal infundibulum the hiatus semilunaris is bounded inferiorly by the sharp concave margin of the uncinate process of the ethmoid bone, and leads into a curved channel, the infundibulum, bounded above by the bulla ethmoidalis and below by the lateral surface of the uncinate process of the ethmoid. ethmoidal infundibulumlateral wall of nasal cavity; the three nasal conchae have been removed (infundibulum labeled at center top)detailsidentifierslatininfundibulum ethmoidaleta98a06.1.02.027 a02.1.07.017ta2738fma75769anatomical terminology