Nictitating Membrane
(redirected from third eyelid)

Also found in: Dictionary/thesaurus, Medical, Wikipedia

0.03 sec.

nictitating membrane

(in reptiles, birds, and some mammals) a thin fold of skin beneath the eyelid that can be drawn across the eye

nictitating membrane [′nik·ə‚tād·iŋ ′mem‚brān]

(vertebrate zoology)

A membrane of the inner angle of the eye or below the eyelid in many vertebrates, and capable of extending over the eyeball.

Nictitating Membrane

a third eyelid, located in the inner corner of the eye in some Euselachiae (fishes) and the majority of terrestrial vertebrates. The nictitating membrane is formed from a fold of the conjunctiva and is located behind the upper and lower eyelids. In terrestrial vertebrates, a transparent nictitating membrane periodically covers the cornea to clean and moisten it. Nictitating membranes are most highly developed in reptiles and birds. Among mammals, a third eyelid is absent in Echidna and Cetacea; apes and humans have rudimentary nictitating membranes in the form of semilunar folds.

Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content.

?Page tools

Printer friendly
Cite / link

Feedback

Mentioned in	?		References in periodicals archive	?		Encyclopedia browser	?		Full browser	?
No references found			AA quick check by your vet would be a good idea as, although it does sound like your Westie has a simple bacterial infection in his eye, there could be a small foreign body lodged behind the third eyelid or damage to the eye itself which is causing the infection to linger. Ring changes for bird-eating kitten by Sunday Mail (Glasgow, Scotland) Sometimes a contact lens or the third eyelid can be used to temporarily cover the defect, giving it a chance to heal, just like a ramp on a newly-repaired road. Good analogies can do the trick; RECORD PETS by Daily Record (Glasgow, Scotland) But this third eyelid will also show once a cat is happy. Cat Eye Care - Is It Important? by Graham Williams / Pets and Animals community			Thiosalt thiosemicarbazide thiosemicarbazone thiospinel thiostreptone Thiosulfate thiosulfonic acid Thiosulfuric Acid thiouracil Thiourea Thira Thíra thiram Third Third All-Russian Congress of Soviets of Peasants Deputies Third All-Russian Congress of Soviets of Workers, Soldiers, and third class Third Conference of the Russian Social Democratic Labor Party Third Congress of Soviets of the Ussr Third Congress of the Russian Social Democratic Labor Party Rsdlp third degree Third Element Third Estate Third Estate tiers etat Third Estate tiers état third eyelid third generation computer third generation language third harmonic Third Internationalists third law of motion Third Law of Thermodynamics third little pig third man third normal form third of May Third Party third proportional third quadrant third rail Third Reich Third Republic Third Section third sound Third Viscount Palmerston Third World third-generation computer third-generation language third-order climatological station third-order reaction third-order relief			Third derivative Third derivative Third Derivative Functional Form third diabetic syndrome third dimension third dimension third dimension third dimension Third District Third Echelon Test Set Third Echelon Test Set Electro Optical Variant Third Ecumenical Council Third Ecumenical Council of Constantinople Third Edition Third Education Group Third Element Third Elementary Education Project Third Epistel of John Third Epistle of John third estate third estate Third Estate Sunday Review Third Estate tiers etat Third Estate tiers état Third European Stratospheric Experiment on Ozone Third Extended File System Third Extended Filesystem third eye third eye Third Eye Blind third eyelid third eyelid eversion third eyelid eversion third eyelid gland third eyelid gland third eyelid gland third eyelid gland prolapse third eyelid gland prolapse third eyelid gland prolapse third eyelid protrusion syndrome third eyelid protrusion syndrome third eyelids third eyelids third eyes third eyes Third Federal Savings and Loan third fibular muscle Third Five-Year Development Plan Third Floor North third force third forces Third Forestry Development Project Third Formant Frequency Third Frontier Action Fund Third Frontier Fuel Cell Program Third Frontier Network Third Frontier Program third gear third gear Third Generation Third Generation Anti-Tank

Encyclopedia

Free Tools:	For surfers: Free toolbar & extensions \| Word of the Day \| Help For webmasters: Free content \| Linking \| Lookup box \| Double-click lookup

Disclaimer
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.

Nictitating Membrane (redirected from third eyelid)

Nictitating Membrane
(redirected from third eyelid)