The parietal eye is a photosensory organ linked to the pineal body, energetic in triggering hormone manufacturing (including reproduction) and thermoregulation. That is perceptible to alters in light and also dark, that does not form images, having actually only a rudimentary retina and lens. That is visible as an opalescent gray clues on the optimal of some lizard"s heads; additionally referred to as "pineal eye" or "third eye."

The parietal eye is the white spot on the top of the iguana"s head.
The parietal eye top top bearded dragons blends in well v its coloring.

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regardless of its typical name, the parietal "eye" cannot check out (discern really images) together their eyes see, yet this is body organ is one very an excellent reason why girlfriend cannot use white irradiate for heat at night, and also why untamed igs (and also some tamer ones) flee from your hand as soon as you swoop down from overhead to pluck them out of your enclosure, or why, once in the car, they duck once you journey under freeway overpasses, and why that takes off prefer a berserker when a teeny tiny speck of a bird or aircraft almost too little to be seen v unaided human being vision goes paris by waaaaaay overhead.

countless skinks and also agamids, such together blue-tongue skinks and also water dragons, have this "eye" as well. Humans have one, too, yet ours has no outlet at the optimal of ours skull (see Circadian Rhythms and also Your biological Clock).

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connected Articles

newspaper Abstracts ~ above Circadian Rhythm and also Thermoregulation in Reptiles

Journal abstracts on Parietal (Pineal) "Eye" duty in Reptiles

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