Lacrimal canaliculi
| Lacrimal canaliculi | |
|---|---|
 | |
| The lacrimal apparatus. Right side. | |
| Latin | canaliculus lacrimalis |
| Gray's | subject #227 1028 |
| Dorlands/Elsevier | c_04/12208445 |
Overview
The lacrimal canaliculi, also known as the lacrimal canals or lacrimal ducts, are the small channels in each eyelid that commence at minute orifices, termed puncta lacrimalia, on the summits of the papillæ lacrimales, seen on the margins of the lids at the lateral extremity of the lacus lacrimalis.
- The superior duct, the smaller and shorter of the two, at first ascends, and then bends at an acute angle, and passes medialward and downward to the lacrimal sac.
- The inferior duct at first descends, and then runs almost horizontally to the lacrimal sac.
At the angles they are dilated into ampullæ; their walls are dense in structure and their mucous lining is covered by stratified squamous epithelium, placed on a basement membrane.
Outside the latter is a layer of striped muscle, continuous with the lacrimal part of the Orbicularis oculi; at the base of each lacrimal papilla the muscular fibers are circularly arranged and form a kind of sphincter.
Clinical significance
Canaliculitis is an inflammation of the canaliculus.[1]
See also
References
External links
- lacrimal+canaliculus at eMedicine Dictionary
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
Head and neck anatomy - accessory organs of the eye | |
|---|---|
| General | Eyebrow - Eyelid - Canthus - Eyelash - Ciliary glands - Orbital septum - Plica semilunaris - Meibomian gland - Palpebral fissure |
| Lacrimal apparatus | Lacrimal lake - Lacrimal gland - Lacrimal canaliculi - Lacrimal punctum - Lacrimal papilla - Nasolacrimal duct - Lacrimal sac |
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