- Home
- Premium Memberships
- Lottery Results
- Forums
- Predictions
- Lottery Post Videos
- News
- Search Drawings
- Search Lottery Post
- Lottery Systems
- Lottery Charts
- Lottery Wheels
- Worldwide Jackpots
- Quick Picks
- On This Day in History
- Blogs
- Online Games
- Premium Features
- Contact Us
- Whitelist Lottery Post
- Rules
- Lottery Book Store
- Lottery Post Gift Shop
The time is now 8:22 am
You last visited
May 6, 2024, 8:22 am
All times shown are
Eastern Time (GMT-5:00)
Parietal Eye
Published:
Parietal eye
A parietal eye, also known as a parietal organ or third-eye is a part of the epithalamus present in some animal species. The eye may be photoreceptive and is usually associated with the pineal gland, regulating circadian rhythmicity and hormone production for thermoregulation.[1]
Function
The lizard-like reptile tuatara has a "well-developed parietal eye, with small lens and retina".[2][3] Parietal eyes are also found in lizards, frogs and lampreys, as well as some species of fish, such as tuna and pelagic sharks, where it is visible as a light-sensitive spot on top of their head. A poorly developed version, often called the parapineal gland, occurs in salamanders. In birds and mammals the parietal organ (but not the pineal gland) is absent.
Physiology
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.[4] The parietal eye uses a different biochemical method of detecting light than rod cells or cone cells in a normal vertebrate eye.[5]
Comments
This Blog entry currently has no comments.
Post a Comment
Please Log In
To use this feature you must be logged into your Lottery Post account.
Not a member yet?
If you don't yet have a Lottery Post account, it's simple and free to create one! Just tap the Register button and after a quick process you'll be part of our lottery community.
Register