iPedia Free Information Center

Information about Naso Lacrimal Canal Opening

The lacrimal apparatus. Right side.
Outline of bones of face, showing position of air sinuses.
Latind. nasolacrimalis
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.

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.

Additional images


Roof, floor, and lateral wall of left nasal cavity.


See also

External links

 •  • [ e]
Accessory organs of the eye
GeneralEyebrow - Eyelid - Canthus - Eyelash - Ciliary glands - Orbital septum - Plica semilunaris - Meibomian gland
Lacrimal apparatusLacrimal lake - Lacrimal gland - Lacrimal canaliculi - Lacrimal punctum - Lacrimal papilla - Nasolacrimal duct
Latin}}} 
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
..... Click the link for more information.
Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. Created and updated by the United States National Library of Medicine (NLM), it is used by the MEDLINE/PubMed
..... Click the link for more information.
Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
..... Click the link for more information.
Tears are a liquid produced by the body's process of lacrimation to clean and lubricate the eyes. The word lacrimation may also be used in a medical or literary sense to refer to crying. Strong emotions, such as sorrow or elation, may lead to crying.
..... Click the link for more information.
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 maxilla.

It is oval in form and measures from 12 to 15 mm.
..... Click the link for more information.
The nasal cavity (or nasal fossa) is a large air-filled space above and behind the nose in the middle of the face.

Function

The nasal cavity conditions the air to be received by the areas of the respiratory tract.
..... Click the link for more information.
nose is a protuberance in vertebrates that houses the nostrils, or nares, which admit and expel air for respiration in conjunction with the mouth.

In most humans, it also houses the nosehairs, which catch airborne particles and prevent them from reaching the lungs.
..... Click the link for more information.
Epiphora may mean:
  • Epiphora (medical), excessive tear production usually a result from an irritation of the eye.
  • Epiphora, a synonym for epistrophe.

..... Click the link for more information.
Punctal plugs (or punctual plugs) are small medical devices shaped somewhat like golf tees that are inserted into the tear ducts (puncta) of the eyes to block them. This prevents the drainage of liquid from the eyes. They are used to treat dry eye.
..... Click the link for more information.
The canal containing the nasolacrimal duct is called the nasolacrimal canal.

It is formed by indentations in the inferior nasal conchae, maxilla and lacrimal bone.

See also

  • Orbit (anatomy)

Additional images


..... Click the link for more information.
Congenital nasolacrimal duct obstruction (CLDO) is literally a tear duct that has failed to open at the time of birth. Around 6% of infants have CLDO, usually experiencing a persistent watery eye even when not crying.
..... Click the link for more information.
In anatomy, the orbit is the cavity or socket of the skull in which the eye and its appendages are situated.

It can also mean the skin which surrounds the eye of a bird.

In the adult human, the volume of the orbit is 30 ml, of which the eye occupies 6.5 ml.
..... Click the link for more information.
The lacrimal apparatus is the physiologic system containing the orbital structures for tear production and drainage[1]. It consists of:
  • (a) the lacrimal gland, which secretes the tears, and its excretory ducts, which convey the fluid to the surface of the

..... Click the link for more information.
The State University of New York Health Science Center at Brooklyn, better known as SUNY Downstate Medical Center, is an academic medical center and is the only one of its kind in the Borough of Brooklyn in New York City.
..... Click the link for more information.
Georgetown University is a private, Jesuit, research university, located in Washington, D.C.'s Georgetown neighborhood. Father John Carroll founded the school in 1789, though its roots extend back to 1634.
..... Click the link for more information.
Eyes are organs of vision that detect light. Different kinds of light-sensitive organs are found in a variety of organisms. The simplest eyes do nothing but detect whether the surroundings are light or dark, while more complex eyes can distinguish shapes and colors.
..... Click the link for more information.
The eyebrow is an area of coarse skin hairs above the eye that follows the shape of the brow ridges.

Functions

The main function of the eyebrow is to prevent moisture, mostly salty sweat and rain, from flowing into the eye, an organ critical to sight.
..... Click the link for more information.
An eyelid is a thin fold of skin and muscle that covers and protects an eye. With the exception of the prepuce and the labia minora, it has the thinnest skin of the whole body. The levator palpebrae superioris muscle retracts the eyelid to "open" the eye.
..... Click the link for more information.
Canthus (pl. canthi, palpebral commissures) is either corner of the eye where the upper and lower eyelids meet.

The bicanthal plane is the transversal plane linking both canthi and defines the upper boundary of the midface.
..... Click the link for more information.
An eyelash or simply lash is one of the hairs that grow at the edge of the eyelid. Eyelashes protect the eye from debris and perform some of the same function as whiskers do on a cat or a mouse in the sense that they are sensitive to being touched, thus providing a warning
..... Click the link for more information.
Glands of Moll, also known as ciliary glands, are modified apocrine sweat glands that are found on the margin of the eyelid. They are next to the base of the eyelashes, and anterior to the Meibomian glands within the distal eyelid margin.
..... Click the link for more information.
The orbital septum (palpebral ligament) is a membranous sheet that acts as the anterior boundary of the orbit. It extends from the orbital rims to the eyelids.
..... Click the link for more information.
The plica semilunaris is a small fold of bulbar conjunctiva on the inner corner of the eye. It is loose, so that eye movements are not restricted.

It is the vestigial remnant of the nictitating membrane (the "third eyelid") which is present in other animals.
..... Click the link for more information.
The meibomian glands (or tarsal glands) are a special kind of sebaceous glands at the rim of the eyelids, responsible for the supply of sebum, an oily substance that prevents evaporation of the eye's tear film, prevents tear spillage onto the cheek, and makes the closed
..... Click the link for more information.
The lacrimal apparatus is the physiologic system containing the orbital structures for tear production and drainage[1]. It consists of:
  • (a) the lacrimal gland, which secretes the tears, and its excretory ducts, which convey the fluid to the surface of the

..... Click the link for more information.
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)[1]. The volume of the lacrimal lake has been estimated to be between 7 and 10 ÂµL.
..... Click the link for more information.
The lacrimal glands are paired glands, one for each eye, that secrete the aqueous layer of the tear film. They are situated in the upper, outer portion of each orbit.

Anatomy


..... Click the link for more information.
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
..... Click the link for more information.
The lacrimal canaliculi, one in each eyelid, commence at minute orifices, termed puncta lacrimalia (or lacrimal punctum, or lacrimal point), on the summits of the papillae lacrimales, seen on the margins of the lids at the lateral extremity of the lacus lacrimalis.
..... Click the link for more information.
lacrimal papilla, the apex of which is pierced by a small orifice, the punctum lacrimale, the commencement of the lacrimal duct.

See also

  • papilla

External links

  • Description at uams.

..... Click the link for more information.


This article is copied from an article on Wikipedia.org - the free encyclopedia created and edited by online user community. The text was not checked or edited by anyone on our staff. Although the vast majority of the wikipedia encyclopedia articles provide accurate and timely information please do not assume the accuracy of any particular article. This article is distributed under the terms of GNU Free Documentation License.
Herod_Archelaus


page counter