Nasolacrimal duct

Dr Craig Hacking and Dr Henry Knipe et al.

The nasolacrimal duct is the terminal part of the nasolacrimal apparatus.

Gross anatomy

The nasolacrimal duct is the inferior continuation of the lacrimal sac and is ~17 mm in length in total. There are two parts to the nasolacrimal duct:

  • intraosseous part (12 mm): enters the lacrimal groove and descends within the nasolacrimal canal of the maxilla
  • membranous part (5 mm): runs in the nasal mucosa; terminates below the inferior nasal meatus as a slit-like opening where it is covered by a mucosal fold called the valve of Hasner
Head and neck anatomy
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Article information

rID: 26916
System: Head & Neck
Section: Anatomy
Synonyms or Alternate Spellings:
  • Naso-lacrimal duct

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Cases and figures

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    Case 1: normal appearance
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