nasal meatus dorsal nasal meatus UBERON:0015223 The dosal nasal meatus is a narrow passage bounded dorsally by the roof of the nasal cavity and ventrally by the dorsal concha. It terminates caudally at the junction of the inner plate of the frontal bone with the cribiform plate and lateral mass of the ethmoid bone. It is the shortest and shallowest of the three meatuses.