Brown pelican nictitating membrane, a translucent membrane that forms an inner eyelid in birds, reptiles, and some mammals. (oceanlight.com)
An outer opaque eyelid that closes during sleep and a semi-opaque inner eyelid called nictitating membrane. (canadiannaturephotographer.com)
Translucent3
The nictitating membrane (from Latin nictare, to blink) is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus to protect and moisten it while maintaining vision. (wikipedia.org)
The nictitating membrane is normally translucent. (wikipedia.org)
The peregrine falcon - deemed the fastest diving bird in the world, with speeds of up to 322km/h - benefits from a translucent third eyelid known as the "nictitating membrane," which covers the eye during those high-speed dives so it remains moist and protected from debris. (buzzfeed.com)
Eyelids1
Unlike the upper and lower eyelids, the nictitating membrane moves horizontally across the eyeball. (wikipedia.org)
Sharks3
The nictitating membrane can be used to protect the eye while attacking prey, as in sharks. (wikipedia.org)
Leopard sharks have a third eyelid called a "nictitating membrane. (wildrepublic.com)
Some sharks have a third lid known as a nictitating membrane , which will fully protect the eye. (howstuffworks.com)
Gland3
A gland of the third eyelid (nictitans gland) or Harder's gland is attached to the nictating membranes of some animals and may produce up to 50% of the tear film. (wikipedia.org)
In some breeds of dogs, the nictitating membrane can be prone to prolapse of the gland of the third eyelid, resulting in a condition called cherry eye. (wikipedia.org)
Taking its name from the pink mass that appears from the inner corner of the dog's eye, the cherry eye condition clinically known as Prolapsed Nictitating Membrane Gland, is a result of the gland on the inner side of the third eyelid prolapsing, becoming red and swollen and covering part of the eye. (rvc.ac.uk)
Extinction1
Gormezano, I. N. Schneiderman, E. Deaux, and I. Fuentes (1962) Nictitating Membrane: Classical Conditioning and Extinction in the Albino Rabbit Science 138:33-34. (wikipedia.org)
Debris1
In birds of prey, the membrane also serves to protect the parents' eyes from their chicks while they are feeding them, and when peregrine falcons go into their 200-mile-per-hour (320 km/h) dives, they will blink repeatedly with their nictitating membranes to clear debris and spread moisture across the eyes. (wikipedia.org)
Eyes4
Nictitating membrane over the eyes of the Spotted Eagle-owl (Bubo africanus) with ear tufts. (creation.com)
A semitransparent film, the nictitating membrane, slides across their eyes when they blink. (mathworks.com)
The irises of the eyes are golden to brown, and the transparent nictitating membrane is pale blue. (projectnoah.org)
The eyes are small with tiny lids and a nictitating membrane. (brainmuseum.org)
Birds2
Fully developed nictitating membranes are found in fish, amphibians, reptiles, birds and mammals, but are rare in primates. (wikipedia.org)
Birds can actively control their nictitating membrane. (wikipedia.org)
Reflex3
In many species, any stimulus to the eyeball (such as a puff of air) will result in reflex nictitating membrane response. (wikipedia.org)
PEA (0.8 mg/kg/min infused for 12 min) and amphetamine (3.2 mg/kg) facilitated the flexor reflex, increased respiration, temperature and the skin twitch reflex latency, caused a marked mydriasis, retracted the nictitating membrane and produced restlessness and stereotypic head movements. (erowid.org)
Partial tolerance developed only to the actions of PEA on the stepping reflex and the nictitating membrane. (erowid.org)
Fold1
In humans, the plica semilunaris (also known as the semilunar fold) and its associated muscles are homologous to the nictitating membranes seen in some other mammals and other vertebrates. (wikipedia.org)
Seals2
Some mammals, such as camels, polar bears, seals and aardvarks, have full nictitating membranes, and many mammals retain a small, vestigial portion of the membrane in the corner of the eye. (wikipedia.org)
When the rainy season ends on the African savannah, the second largest frog in the world burrows 6 to 8 inches underground and seals itself in a mucus membrane that "essentially hardens into a cocoon. (mentalfloss.com)
Protect the eye1
The nictating membrane 'blinks' by sliding laterally to protect the eye and keep it moist. (canadiannaturephotographer.com)
Small1
in many mammals, a small, vestigial portion of the nictitating membrane remains in the corner of the eye. (wikipedia.org)
Response1
This research reveals that elimination of the rabbit nictitating membrane response occurred during continuous CS-US pairings. (edu.au)
Fully1
In most primate species, a plica semilunaris is generally not present, although fully developed nictitating membranes can be found in lemurs and lorisoid primates. (wikipedia.org)
Lack1
Although humans and owls share binocular vision, owls are equipped with an important feature that we lack: nictitating membranes. (abcbirds.org)
Form1
This will form a modest-sized bleb over the nictitating membrane. (jove.com)
The most common physical examination finding was decreased or absent anal tone, followed by absent pupillary light reflexes and elevated nictitating membrane. (avma.org)
Mucous membrane2
Supporting care of the eyes, the nictitating membrane and the mucous membrane of the nostrils. (jedds.com)
A fold of the mucous membrane of the CONJUNCTIVA in many animals. (nih.gov)
Conjunctiva3
Dogs also have a third eyelid (nictitating membrane) that is covered by conjunctiva and not normally visible. (thepetstaff.com)
The most common ophthalmic manifestations in all animals were conjunctival congestion, chemosis, ocular purulent or mucopurulent discharge, different sized multilobular masses with irregular surface on the bulbar conjunctiva of the nictitating membrane (12), or on the upper eye lid conjunctiva (2) or on the lower eye lid conjunctiva with skin involvement as well. (vin.com)
The conjunctiva is the membrane that covers the part which we see of the sclera. (animalwised.com)
Third membrane1
It is a fact that cats possess a third membrane known as the nictitating membrane. (oxfordpets.com)
Eyelid14
The nictitating membrane (from Latin nictare, to blink) is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus to protect and moisten it while maintaining vision. (wikipedia.org)
A gland of the third eyelid (nictitans gland) or Harder's gland is attached to the nictating membranes of some animals and may produce up to 50% of the tear film. (wikipedia.org)
In some breeds of dogs, the nictitating membrane can be prone to prolapse of the gland of the third eyelid, resulting in a condition called cherry eye. (wikipedia.org)
Other species guard their vision with a third eyelid called a nictitating membrane. (discovermagazine.com)
They have a special eyelid (called a nictitating membrane ) for sun and dust protection. (zooborns.com)
It show his nictitating membrane (the transparent 3rd eyelid) beginning to sweep across his eye. (raptorresource.org)
Cherry eye - eversion of the nictitating membrane or 'third eyelid' generally occurs in younger dogs and can be surgically corrected. (pdsa.org.uk)
Cats have a useful ocular structure called a nictitating membrane, or third eyelid. (cats.com)
The third eyelid - called a nictitating membrane - is a thin layer of tissue that closes diagonally across the eye, from the inside to the outside. (earthlife.net)
Usually, this membrane moves quite fast to the extent that we seldom see them blinking using the third eyelid. (oxfordpets.com)
When they dive into the water, Osprey close their third eyelid - called a nictitating membrane - which is semi-transparent. (peregrinefund.org)
From their nictitating membrane (third eyelid), large oil glands, dense plumage, and unique underwater foraging techniques, this bird is truly a "water ouzel. (nevadaaudubon.org)
This infection causes the presentation of a third eyelid in the inner corner of the eye, known as the nictitating membrane , which is not usually visible. (animalwised.com)
nictitating membrane (third eyelid) is present, that there is coloration on the cornea or that your dog is experiencing any pain when touching its eyes: you should look at the affected area and look for any injury or foreign body. (animalwised.com)
Dives1
One fascinating adaptation that helps eagles during their dives is the nictitating membrane. (dockeryfarms.org)
This membrane is also known to help in covering the eye while allowing them to see because of its semi-transparent nature. (oxfordpets.com)
Closes1
Played by Alison Elliott, who mysteriously never became the biggest movie star of the 90s, Rachel has the emotional equivalent of a nictitating membrane, an aperture that opens to show vulnerability, and closes to negate its possibility of ever existing. (filmschoolrejects.com)
Present1
In most primate species, a plica semilunaris is generally not present, although fully developed nictitating membranes can be found in lemurs and lorisoid primates. (wikipedia.org)
Corner of2
in many mammals, a small, vestigial portion of the nictitating membrane remains in the corner of the eye. (wikipedia.org)
Some mammals, such as camels, polar bears, seals and aardvarks, have full nictitating membranes, and many mammals retain a small, vestigial portion of the membrane in the corner of the eye. (wikipedia.org)
Found1
Using biologically constrained models, we found that variable and unreliable synapses serve to increase cortical firing by means of increasing membrane fluctuations, similar to high conductance states. (elifesciences.org)
Injury1
Woodpeckers tighten their nictitating membrane a millisecond prior to their beak impacting the trunk of a tree to prevent shaking-induced retinal injury. (wikipedia.org)
Result1
In many species, any stimulus to the eyeball (such as a puff of air) will result in reflex nictitating membrane response. (wikipedia.org)
Serves1
This nictitating membrane is typically hidden from view but serves several vital functions, including protecting the eye, spreading tears across the cornea, and containing a specialized gland - the nictitans. (insuranceranked.com)
Ability2
Their streamlined bodies, nictitating membrane, and positioning techniques all contribute to their ability to dive at incredible speeds. (dockeryfarms.org)
In the center of the eye, we have the pupil surrounded by the iris, a pigmented membrane that has the ability to contract in reaction to light. (animalwised.com)
Opening the eye1
The membrane can, however, be seen clearly when gently opening the eye of the healthy animal when it is asleep, or by pushing down/applying pressure on the eyeball, which will cause it to appear. (wikipedia.org)