The following is true about nasolacrimal duct
Ref BDC volume 3,6th edition pg 76 It begins at the lower end of the lacrimal sac, runs downwards, backwards and laterally, and opens into the inferior meatus of the nose. Nasolacrimal duct is a membranous passage 18mm long. Notes: A fold of mucous membrane called valve of Hasner forms an imperfect valve at the lower end of the duct.
Directed downward, forward, and medially
Directed downward, backward and laterally
Drains in posterior pa of inferior meatus
18 cm in length
Head and neck