Left Nasolacrimal Duct (Ductus nasolacrimalis sinister)
Educational content only — not medical advice.
Anatomy
The left nasolacrimal duct is a membranous canal approximately 18 mm long that conveys tear fluid from the lower end of the left lacrimal sac to the inferior meatus of the left nasal cavity. Enclosed within the bony nasolacrimal canal formed by the maxilla, lacrimal bone, and inferior nasal concha, its distal nasal ostium is guarded by the mucosal valve of Hasner.
Clinical notes
Congenital nasolacrimal duct obstruction (imperforate valve of Hasner) is common in neonates, causing persistent epiphora and crusting, resolving spontaneously or treated by lacrimal probing.
Related structures
Educational references
FAQ
What is the role of the Left Nasolacrimal Duct?
The left nasolacrimal duct is a membranous canal approximately 18 mm long that conveys tear fluid from the lower end of the left lacrimal sac to the inferior meatus of the left nasal cavity. Enclosed within the bony nasolacrimal canal formed by the maxilla, lacrimal bone, and inferior nasal concha, its distal nasal ostium is guarded by the mucosal valve of Hasner.
Why is the Left Nasolacrimal Duct clinically important?
Congenital nasolacrimal duct obstruction (imperforate valve of Hasner) is common in neonates, causing persistent epiphora and crusting, resolving spontaneously or treated by lacrimal probing.
Source & license
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