Nasolacrimal duct opens into the
Nasolacrimal duct is membranous passage 18 mm long.it begins at the lower end of lacrimal sac, runs downwards, backward and laterally, and opens into the inferior meatus of the nose.A fold of mucous membrane called the valve of Hasner forms an imperfect valve at the lower end of the duct. Ref.BDC volume 3;sixth edition pg.76
Supreme meatus
Superior meatus
Middle meatus
Inferior meatus
Head and neck