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What is Nasolacrimal duct drains into: and explain in detail?
Key Concept:

 The inferior meatus lies underneath the inferior concha, and is the largest of the three meatuses. 
 The nasolacrimal duct opens into it at the junction of its anterior one-third and posterior two-thirds. 
 This opening is guarded by the lacrimal fold, or Hasner’s valve.