Nasolacrimal duct
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"orifice du canal naso-lacrymal l.m. - Dictionnaire médical de l'Académie de Médecine". www.academie-medecine.fr. Retrieved 2024-06-01.
It has been suggested that this article be merged with nasolacrimal canal. (Discuss) Proposed since March 2024. |
Nasolacrimal duct | |
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Details | |
Identifiers | |
Latin | ductus nasolacrimalis |
MeSH | D009301 |
TA98 | A15.2.07.070 |
TA2 | 6859 |
FMA | 9703 |
Anatomical terminology |
The nasolacrimal duct (also called the tear duct) carries tears from the lacrimal sac of the eye into the nasal cavity.[1][2] The duct begins in the eye socket between the maxillary and lacrimal bones, from where it passes inferoposteriorly before opening into the inferior nasal meatus.
Excess tears flow through the nasolacrimal duct which drains into the inferior nasal meatus. This is the reason the nose starts to run when a person is crying or has watery eyes from an allergy, and why one can sometimes taste eye drops. This is for the same reason when applying some eye drops it is often advised to close the nasolacrimal duct by pressing it with a finger to prevent the medicine from escaping the eye and having unwanted side effects elsewhere in the body as it will proceed through the canal to the nasal cavity.
Like the lacrimal sac, the duct is lined by stratified columnar epithelium containing mucus-secreting goblet cells, and is surrounded by connective tissue.