| Lacrimal canaliculi | |
|---|---|
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| The lacrimal apparatus. The lacrimal apparatus is the physiologic system containing the orbital structures for Tear production and drainage Right side. | |
| Latin | canaliculus lacrimalis |
| Gray's | subject #227 1028 |
| Dorlands/Elsevier | c_04/12208445 |
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. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. the Peripheral organs of the Special senses the organs of Taste ( Peripheral gustatory or Elsevier, the world's largest Publisher of Medical and Scientific literature, forms part of the Reed Elsevier group An eyelid is a thin fold of skin that covers and protects an Eye. The Lacrimal canaliculi, one in each Eyelid, commence at minute orifices termed puncta lacrimalia (or lacrimal punctum, or lacrimal point) At the basal angles of the Lacus lacrimalis, on the margin of each Eyelid, is a small conical elevation the lacrimal papilla, the apex of which is pierced by a small The lacrimal lake is the pool of Tears in the lower Conjunctival cul-de-sac which drains into the opening of the tear drainage system (the Puncta lacrimalia
- 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 lacrimal sac is the upper dilated end of the Nasolacrimal duct, and is lodged in a deep groove formed by the Lacrimal bone and Frontal process of the
- The inferior duct at first descends, and then runs almost horizontally to the lacrimal sac. The lacrimal sac is the upper dilated end of the Nasolacrimal duct, and is lodged in a deep groove formed by the Lacrimal bone and Frontal process of the
At the angles they are dilated into ampullæ. Microscopically, they are lined by nonkeratinizing stratified squamous epithelium surrounded by fibrous tissue. In Anatomy, squamous epithelium (from Latin squama, "scale" is an Epithelium characterised by its most superficial layer consisting
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. The orbicularis oculi is a muscle in the face that closes the Eyelids. A sphincter is a structure usually a circular Muscle, that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological
Contents |
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. The lacrimal apparatus is the physiologic system containing the orbital structures for Tear production and drainage eMedicine is an online clinical medical knowledge base that was founded in 1996 by Scott Plantz and Richard Lavely two medical doctors The public domain is a range of abstract materials &ndash commonly referred to as Intellectual property &ndash which are not owned or controlled by anyone Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened is an English-language Human anatomy Textbook 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.
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