nictitating membrane - Definition. Was ist nictitating membrane
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Was (wer) ist nictitating membrane - definition

TRANSPARENT OR TRANSLUCENT THIRD EYELID IN SOME ANIMALS
Third eyelid; Nictating membrane; Nictating Membrane; Nictating eyelid; Nictitating eyelid; Nicitating membrane; Inner eyelid; Palpebra tertia; Nictitating; Semilunar fold; Nictitation; Nictitating membranes; Nictitans
  • The nictitating membrane of a [[blue shark]]
  • medial]] [[canthus]]
  • [[Common goldeneye]] showing the transparent nictitating membrane characteristic of diving animals
  • Slow motion video of a [[common buzzard]] yawning while perched on an antenna, with nictitating membrane visible (deployed asynchronously on left and right eye).
  • The [[plica semilunaris of conjunctiva]] is a vestigial remnant of a nictitating membrane in humans.
  • The nictitating membrane (mid-blink) of a [[bald eagle]]
  • The nictitating membrane (completely closed) of a [[black crowned crane]], right eye
  • Second eyelid on a domestic dog

nictitating membrane         
¦ noun Zoology a whitish membrane forming an inner eyelid in birds, reptiles, and some mammals.
Origin
C18: nictitating based on med. L. nictitat- 'blinked', frequentative of nictare.
Nictitating membrane         
The nictitating membrane (from Latin [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. All Anura(tailless amphibians), and some reptiles, birds, and sharks have full nictitating membranes; in many mammals, a small, vestigial portion of the nictitating membrane remains in the corner of the eye.
third eyelid         
¦ noun informal term for nictitating membrane.

Wikipedia

Nictitating membrane

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. All Anura(tailless amphibians), and some reptiles, birds, and sharks have full nictitating membranes; in many mammals, a small, vestigial portion of the nictitating membrane remains in the corner of the eye. Some mammals, such as cats, camels, polar bears, seals and aardvarks, have full nictitating membranes. Often called a third eyelid or haw, it may be referred to in scientific terminology as the plica semilunaris, membrana nictitans, or palpebra tertia.