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Topic: Iris (anatomy)


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  Iris (anatomy) - Wikipedia, the free encyclopedia
The iris is an annulus (or flattened ring) consisting of pigmented fibrovascular tissue known as a stroma.
Just in front of the root of the iris is the region through which the aqueous humour constantly drains out of the eye, with the result that diseases of the iris often have important effects on intraocular pressure, and indirectly on vision.
Iris color is a highly complex phenomenon consisting of the combined effects of texture, pigmentation, fibrous tissue and blood vessels within the iris stroma, which together make up an individual's epigenetic constitution.
en.wikipedia.org /wiki/Iris_(anatomy)   (1999 words)

  
 Encyclopedia: Iris (anatomy)
In Greek mythology, Iris was the daughter of Thaumas and the ocean nymph Electra and one of the Oceanids (according to Hesiod), the personification of the rainbow and messenger of the gods.
Definitions The iris in vertebrates (and even chordates at large) is an apposition of two classes of biological tissue material, of distinct embryological origins: the epithelia, posteriorly (towards the posterior pole of the eyeball) the stroma, anteriorly (towards the anterior pole of the eyeball) Origins The epithelia are two in...
Anatomy The iris pigment epithelium (IPE) is a two-cell thick layer of cuboidal cells lying behind the iris.
www.nationmaster.com /encyclopedia/Iris_%28anatomy%29   (4261 words)

  
 Iris (anatomy)
Iris, in anatomy, is the sphincter around the pupil of the eye, permitting the pupil to open and close to control the amount of light striking the retina.
The iris is brightly pigmented, with colours ranging from grey to green, blue, brown, and nearly purple or fl.
A person's "eye colour" is actually the colour of their iris (except, of course, that a fl eye is a bruise[?] of the skin around the eye, and pink eye is a kind of infection).
www.ebroadcast.com.au /lookup/encyclopedia/ir/Iris_of_the_eye.html   (158 words)

  
 X. The Organs of the Senses and the Common Integument. 1c. 1. The Tunics of the Eye. Gray, Henry. 1918. Anatomy of the ...   (Site not responding. Last check: 2007-11-07)
The posterior surface of the iris is of a deep purple tint, being covered by two layers of pigmented columnar epithelium, continuous at the periphery of the iris with the pars ciliaris retinæ.
The color of the iris is produced by the reflection of light from dark pigment cells underlying a translucent tissue, and is therefore determined by the amount of the pigment and its distribution throughout the texture of the iris.
The nerves of the choroid and iris are the long and short ciliary; the former being branches of the nasociliary nerve, the latter of the ciliary ganglion.
www.bartleby.com /107/225.html   (5591 words)

  
 Iris (anatomy) - Encyclopedia, History, Geography and Biography
The iris is usually strongly pigmented, with colours ranging from brown to green, blue, grey, and hazel.
Occasionally its colour is due to lack of pigmentation, as in the pinkish-white of oculo-cutaneous albinism, or to obscuration of its pigment by blood vessels, as in the red of an abnormally vascularised iris (although human albinos generally have very light blue eyes, as the unpigmented color of the human iris is a pale blue).
A person's "eye colour" is actually the colour of one's iris, since the cornea is transparent and the white sclera lies entirely outside the area of interest.
www.arikah.net /encyclopedia/Iris_%28anatomy%29   (2051 words)

  
 Iris (anatomy) : Information and resources about Iris (anatomy) : School Work Guru
In anatomy, the iris (classical plural irides) is the most visible part of the eye.
The iris is brightly pigmented, with colours ranging from red (no pigment at all, like in oculo-cutaneous albinism), to gray, green, blue, basic brown, fl, and hazel.
Acquiring the iris image, sometimes without the person's approval, and storing it in a database for purposes of identification is a biometric method used for the recognition of human individuals.
www.schoolworkguru.org /encyclopedia/i/ir/iris__anatomy_.html   (655 words)

  
 Anatomy, Physiology, and Development of the Iris.   (Site not responding. Last check: 2007-11-07)
The iris is a protected internal organ of the eye, located behind the cornea and the aqueous humour, but in front of the lens.
The layers of the iris have both ectodermal and mesodermal embryological origin, consisting of (from back to front): a darkly pigmented epithelium; pupillary dilator and sphincter muscles; heavily vascularized stroma (connective tissue of interlacing ligaments containing melanocytes); and an anterior layer of chromataphores and melanocytes with a genetically determined density of melanin pigment granules.
Iris colour is determined mainly by the density of the stroma and its melanin content, with blue irises resulting from an absence of pigment: longer wavelengths differentially penetrate while shorter wavelengths are reflected and scattered, a phenomenon resembling that which makes the sky blue.
www.cl.cam.ac.uk /users/jgd1000/anatomy.html   (495 words)

  
 Iris - Wikipedia, the free encyclopedia
Iris (anatomy), the sphincter around the pupil of the eye, named for the colors in human and animal eyes
Hurricane Iris and Typhoon Iris, tropical cyclones in the Atlantic and the Western Pacific.
Iris, a fictional character in Lufia 2: Rise of the Sinistrals, for SNES
en.wikipedia.org /wiki/Iris   (441 words)

  
 The Iris
The iris, visible through the clear cornea as the colored disc inside the eye, is a thin diaphragm composed mostly of connective tissue and smooth muscle fibers.
The iris divides the anterior compartment, the space separating the cornea and the lens, into the anterior chamber (between the cornea and the iris) and the posterior chamber (between the iris and the lens).
Anatomical structures posterior to the iris, which also are part of the uvea, are the ciliary body (within which is the ciliary muscle which controls the shape of the crystalline lens) and the choroid (located underneath the retina and which contains the retina’s blood supply).
www.tedmontgomery.com /the_eye/iris.html   (1056 words)

  
 Iris - eye anatomy
The round opening in the center of the iris is called the pupil.
The iris is embedded with tiny muscles that dilate (widen) and constrict (narrow) the pupil size.
The iris is flat and divides the front of the eye (anterior chamber) from the back of the eye (posterior chamber).
www.stlukeseye.com /anatomy/Iris.asp   (153 words)

  
 eMedicine - Hyperopia, Phakic IOL : Article by Daljit Singh, MS, DSc   (Site not responding. Last check: 2007-11-07)
The iris is 0.5 mm thick at the root and 0.6 mm at the collarette.
An iris claw lens is attached to the peripheral anterior surface of the iris by pushing a fold of the iris into the 2 claws of the lens.
Otherwise, it impinges on the iris, the pupil, and the crystalline lens.
www.emedicine.com /oph/topic662.htm   (6612 words)

  
 Iris (anatomy)   (Site not responding. Last check: 2007-11-07)
In anatomy, the iris (correct classical plural: irides) is the most visible part of the eye.
Acquiring an iris image, sometimes without the person's approval, and storing it in a database for purposes of identification is a biometric method used for the recognition of human individuals.
Proponents of iris scan insist on this method's high sensitivity and tend to ignore the rate of false positive results and measures of overall accuracy, both of which are unsurpassed in simple fingerpinting.
portaljuice.com /iris__anatomy_.html   (950 words)

  
 MSN Encarta - Search Results - iris
Iris (plant), common name for a family of herbaceous flowering plants.
The entire eye, often called the eyeball, is a spherical structure approximately 2.5 cm (about 1 in) in diameter with a pronounced bulge on its...
Iris (mythology), in Greek mythology, goddess of the rainbow, the daughter of the Titan Thaumas and Electra, daughter of the Titan Oceanus.
ca.encarta.msn.com /iris.html   (108 words)

  
 Search Results for "Iris"
It supplies branches to the cornea, ciliary body, and iris; to the lacrimal gland and conjunctiva; to the part of the mucous...
...crystalline lens, enclosed in its capsule, is situated immediately behind the iris, in front of the vitreous body, and encircled by the ciliary processes, which slightly...
The axons arise from the nucleus of the oculomotor nerve and pass...
www.bartleby.com /cgi-bin/texis/webinator/sitesearch?FILTER=col107%amp;query=Iris   (294 words)

  
 World War 1 and 2 - Iris (anatomy)
In anatomy, the iris (correct classical plural, irides) is the most visible part of the eye of vertebrates, including humans.
The iris is usually strongly pigmented, with colours ranging from brown to green, blue, gray, and hazel.
Occasionally its colour is due to lack of pigmentation, as in the pinkish-white of oculo-cutaneous albinism, or to obscuration of its pigment by blood vessels, as in the red of an abnormally vascularised iris.
www.worldwardiary.com /history/Blue-eye   (1485 words)

  
 Comparative Ophthalmology Notes: Chapter 11 - Uvea   (Site not responding. Last check: 2007-11-07)
The uvea (uveal tract) is the vascular tunic of the eye and consists of the iris, ciliary body and choroid.
This is a region formed by the junction of the iris and cornea and is composed of pectinate ligament, trabecular meshwork and aqueous humor outflow paths.
The pupillary membrane arises from the iris collarette; this is important in differentiating persistent pupillary membrane from iridal synechiae which usually arise from the pupillary border of the iris.
www.vetmed.ucdavis.edu /courses/vet_eyes/conotes/con_chapter_11.html   (5656 words)

  
 Howstuffworks "How Vision Works"
The color of the iris is determined by the color of the connective tissue and pigment cells.
The iris has two muscles: The dilator muscle makes the iris smaller and therefore the pupil larger, allowing more light into the eye; the sphincter muscle makes the iris larger and the pupil smaller, allowing less light into the eye.
The aqueous humor is divided into two sections called the anterior chamber (in front of the iris) and the posterior chamber (behind the iris).
science.howstuffworks.com /eye1.htm   (805 words)

  
 SurfWax Archives: News, Reviews and Articles On Iris
Iris Chang, a best-selling author who chronicled the Japanese occupation of China and the history of Chinese immigrants in the United States, was found dead in her car of a self-inflicted gunshot.
Iris Chang was really pissed at this article that criticizes her and her book that was on the her home town paper San...
Iris is still working on detecting environmental and health problems to the tissues and has published many studies over the years.
news.surfwax.com /anatomy/archives/Iris_anatomy.html   (2742 words)

  
 SurfWax: News, Reviews and Articles On Iris
An innumerable variety of characteristics in the fibers of the iris correspond to parts of the body, resulting in her diagnosis of areas of weakness and strength and in the ability to recommend nutritional supplements.
Iris Padilla, a University College freshman who was recently hired at the Huffman as a facility attendant, said she was told by her supervisors that the splurge would last about six weeks.
Iris Murdoch's final book demonstrates the toll Alzheimer's took on the famed novelist before taking her life in 1999, researchers sayIris Murdoch's final book demonstrates the toll Alzheimer's took on the famed novelist before taking her life in 1999, researchers say...
anatomy.surfwax.com /files/Iris_anatomy.html   (4767 words)

  
 Talk:Iris (anatomy) - Wikipedia, the free encyclopedia
Kingturtle is right, and so is Montréalais, but what is unique to the iris remains unique and well characterized by The iris is the only living tissue always visible naturally, with open eyes methinks.
However, in most practical situations, both you and your eyes are unaware of the iris scan (which is purposely hidden near the ATMs for instance, by design, and has no chance to adjust pupil size, that's for sure.
I don't understand why Elf deleted this link for the reason "I couldn't see what it had to do with "Iris", let alone specifically "Iris (anatomy)." when that is exactly why the link was created in the first place..
www.wikipedia.org /wiki/Talk:Iris_%28anatomy%29   (1191 words)

  
 Eye Anatomy: Iris and Pupil   (Site not responding. Last check: 2007-11-07)
The iris is the part of the eye that identifies your eye color, and is shaped like a flat donut.
The pupil is simply the hole in the middle of the iris that light passes through.
It finally hits you that the picture is terrifying, and you shun it away, while your iris narrows the pupil, allowing less light in.
www.longviewvision.com /anatomy/pupiliris.htm   (307 words)

  
 BrainConnection.com - The Anatomy of Vision
The anatomy of the visual system provides important clues about how the brain is structured in general, and about how we humans solve the complex problem of sight in particular.
Light travels through this fluid to reach the iris (named for the Roman goddess of the rainbow).
The hole in the center of the iris, called the pupil, dilates and constricts to control the amount of light entering the eye.
www.brainconnection.com /topics?main=anat/vision-anat   (618 words)

  
 Constitutional Medicine & Iris Diagnosis
Unfortunately, the anatomy of the iris (the relation of the organs/iris map) is the weakest point in the iris diagnosis.
I don’t think that the area of iris anatomy has reached a scientific level (that is my personal opinion and also the opinion of Prof.
But, the signs of the iris are clear and based on the signs of the iris you can do therapeutic treatment for example for rheumatism and other conditions.
www.news2news.com /news/iris/2000/5/a_4_2.htm   (1179 words)

  
 Re: What triggers dark spots on the eye iris?
But in some conditions like Fuch's heterochromic iridocyclitis, one iris is a different color than the other and is often associated with glaucoma and iritis in the lighter iris.
Iris nevi are similar to freckles found on your skin but do not grow or change color and completely benign.
On the other hand, tumors of the iris are usually dark masses that can definitely change the color of your iris.
www.madsci.org /posts/archives/Jun2003/1055278317.An.r.html   (216 words)

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