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This is an old revision of this page, as edited by 129.2.129.218 (talk) at 07:17, 1 February 2013 (→Function). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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Where is it?

The article doesn't say where exactly on the tuatara this third eye is located. The picture may suggest something but isn't entirely clear either. Thanks. -- 71.71.192.231 (talk) 01:51, 22 December 2007 (UTC)[reply]

I agree. Could someone perhaps modify the image with an arrow or similar marking? It is not very clear. Thanks. -- 125.236.161.221 (talk) 02:58, 5 January 2008 (UTC)[reply]
the text says on the forehead, especially of the young. the image shows an adult in side view. does anyone just have a different image? of a young one in front top view? —Preceding unsigned comment added by 208.54.94.60 (talk) 13:27, 13 March 2008 (UTC)[reply]

The language is almost entirely technical and inaccessible to a general reader, it needs to use words like "head" "mounth" "between the eyes" but I can't even figure out where to start amongst all the epi-whatevers.~~

Physiology

I thought the section on Physiology was vague and un-descriptive. I wrote an alternative, but I want to submit it for concurrence in case I made a mistake. I also need more references about the structure in other classes like those of fish.

The parietal eye is a part of the pineal complex, which is a part of the epithalamus located on the diencephalon. The term is used to describe multiple specific structures in different species. The parietal eye can be a frontal (parapineal) organ which either penetrates the skull (such as in frogs) or does not penetrate it (salamanders). In other animals, the parietal eye is a part of the epiphysis (the pineal organ, or pineal gland if mostly endocrine), such as with lizards, tuatara, and fish, where it may resemble the parietal organ by being an anterior evagination. In most cases it contains photoreceptive cells but may not be capable of receiving light.[1] The parietal eye uses a different biochemical method of detecting light than rod cells or cone cells in a normal vertebrate eye.[2]

Here is the original for comparison.

The parietal eye is a part of the epithalamus, which can be divided into two major parts; the epiphysis (the pineal organ, or pineal gland if mostly endocrine) and the parietal organ (often called the parietal eye, or third eye if it is photoreceptive). It arises as an anterior evagination of the pineal organ or as a separate outgrowth of the roof of the diencephalon. In some species, it protrudes through the skull.[3] The parietal eye uses a different biochemical method of detecting light than rod cells or cone cells in a normal vertebrate eye.[4]

The Tuatara article states that the Tuatara's parietal eye "has its own lens, cornea, retina with rod-like structures, and degenerated nerve connection to the brain, suggesting it evolved from a real eye." The phrase "rod-like structures" appears to conflict with both the original and re-written version, and should be clarified at some point by someone who is familiar with the Tuatara's rod-like structures. —Preceding unsigned comment added by 72.244.206.65 (talk) 22:30, 15 May 2011 (UTC)[reply]

Function

The function section merely goes over morphology in various groups, it says nothing about the actual function of the structure. Troodon311 (talk) 14:21, 26 May 2010 (UTC)[reply]

Indeed. And I'm too lazy to do anything about it. Just like everyone else. —iNkubusse? 11:28, 30 January 2012 (UTC)[reply]

Man I was really disappointed too, I was really hoping to learn what the 3rd eye did but it just listed unrelated stuff.129.2.129.218 (talk) 07:17, 1 February 2013 (UTC)Mason[reply]

Bad reference

This reference:

^ "Parietal eye". Tuatara Glossary. School of Biological Sciences, Victoria University of Wellington. 2007-09-11. Retrieved 2008-05-28.

Does not refer to the parietal eye, and therefore should be removed. I tried removing it, but it was reverted. Rhetth (talk) 17:18, 10 January 2011 (UTC)[reply]

Done. I looked for a replacement link, but could not find it. Luckily the actual quotation comes from a different site, so no info had to be removed. --TheAlphaWolf (talk) 13:49, 11 January 2011 (UTC)[reply]
A replacement link was easy to find at the Internet Archive's Wayback Machine. --Stemonitis (talk) 14:12, 11 January 2011 (UTC)[reply]
  1. ^ Zug, George (2002). Herpetology: An Introductory Biology of Amphibians and Reptiles, Second Edition. San Diego: Academic Press. p. 75. ISBN 0-12-782622-X. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
  2. ^ Xiong, Wei-Hong (1998). "An unusual cGMP pathway underlying depolarizing light response of the vertebrate parietal-eye photoreceptor". Nature Neuroscience. 1: 359–65. doi:10.1038/1570. Retrieved 2007-02-22. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
  3. ^ Zug, George (2002). Herpetology: An Introductory Biology of Amphibians and Reptiles, Second Edition. San Diego: Academic Press. p. 75. ISBN 0-12-782622-X. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
  4. ^ Xiong, Wei-Hong (1998). "An unusual cGMP pathway underlying depolarizing light response of the vertebrate parietal-eye photoreceptor". Nature Neuroscience. 1: 359–65. doi:10.1038/1570. Retrieved 2007-02-22. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
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