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Nasolacrimal duct
From Wikipedia, the free encyclopedia
| Nasolacrimal duct | |
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| The lacrimal apparatus. Right side. | |
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| Outline of bones of face, showing position of air sinuses. | |
| Latin | d. nasolacrimalis |
| Gray's | subject #227 1029 |
| MeSH | Nasolacrimal+Duct |
| Dorlands/Elsevier | d_29/12314970 |
The nasolacrimal duct carries tears from the lacrimal sac into the nasal cavity. Excess tears flow through nasolacrimal duct which opens in the nose. This is the reason the nose starts to run when a person is crying, or why you can sometimes taste eye drops.
Like the lacrimal sac, the duct is lined by stratified columnar epithelium containing mucus-secreting goblet cells, and is surrounded by connective tissue.
Obstruction of the nasolacrimal duct leads to the excess overflow of tears called epiphora. Persons with dry eye conditions can be fitted with punctal plugs that seal the ducts to limit the amount of fluid drainage and retain moisture.
The canal containing the nasolacrimal duct is called the nasolacrimal canal.
 Roof, floor, and lateral wall of left nasal cavity. |
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| General | Eyebrow - Eyelid - Canthus - Eyelash - Ciliary glands - Orbital septum - Plica semilunaris - Meibomian gland |
| Lacrimal apparatus | Lacrimal lake - Lacrimal gland - Lacrimal canaliculi - Lacrimal punctum - Lacrimal papilla - Nasolacrimal duct - Lacrimal sac |