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{{BioPsy}}
 
{{BioPsy}}
[[Image:Gray753.png|thumb|300px|Deep dissection of cortex and brain-stem. (Optic radiation labeled at center left.)]]
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{{Infobox Brain|
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Name = {{PAGENAME}} |
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Latin = radiatio optica |
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GraySubject = |
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GrayPage = |
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Image = Gray753.png |
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Caption = Deep dissection of cortex and brain-stem. (Optic radiation labeled at center left.) |
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Image2 = Right_superior_quadrantanopia.png |
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Caption2 = '''Right superior quadrantanopia'''. The areas of the visual field lost in each eye are shown as black areas. This visual field defect is characteristic of damage to ''Meyer's loop'' on the left side of the brain. |
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IsPartOf = |
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Components = |
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Artery = |
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Vein = |
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BrainInfoType = ancil |
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BrainInfoNumber = 529 |
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MeshName = |
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MeshNumber = |
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DorlandsPre = r_01 |
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DorlandsSuf = 12686139 |
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}}
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The '''geniculo-calcarine tract''' (also known as the '''optic radiation''') is a collection of [[axon]]s from [[relay neuron]]s in the [[lateral geniculate nucleus]] of the [[thalamus]] carrying visual information to the [[visual cortex]] (also called ''striate cortex'') along the [[calcarine fissure]]. There is one such tract on each side of the [[brain]].
   
[[Image:Right_superior_quadrantanopia.png|thumb|300px|'''Right superior quadrantanopia'''. The areas of the visual field lost in each eye are shown as black areas. This visual field defect is characteristic of damage to ''Meyer's loop'' on the left side of the brain.]]
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==Parts==
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A distinctive feature of the optic radiations is that they split into two parts on each side:
   
The '''geniculo-calcarine tract''', also known as the '''optic radiation''', is a collection of [[axon]]s from [[relay neuron]]s in the [[lateral geniculate nucleus]] of the [[thalamus]] carrying visual information to the [[visual cortex]] (also called ''striate cortex'') along the [[calcarine fissure]]. There is one such tract on each side of the [[brain]].
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* The fibers from the inferior [[retina]] must pass into the [[temporal lobe]] by looping around the [[Lateral ventricles|inferior horn of the lateral ventricle]]. These fibers, which carry information from the superior part of the [[visual field]], are called '''Meyer's loop''' or '''Archambault's loop'''. A lesion in the temporal lobe that results in damage to Meyer's loop causes a characteristic loss of [[Visual perception|vision]] in a superior quadrant.
   
A distinctive feature of the optic radiations is that they split into two parts on each side:
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* The fibers from the superior retina travel straight back to the [[occipital lobe]] in the [[internal capsule|retrolenticular limb of the internal capsule]] to the visual cortex. They carry information from the inferior part of the visual field and, taking the shorter path, are less susceptible to damage.
   
:* The fibers from the inferior [[retina]] must pass into the [[temporal lobe]] by looping around the [[Lateral ventricles|inferior horn of the lateral ventricle]]. These fibers, which carry information from the superior part of the [[visual field]], are called '''Meyer's loop''' or '''Archambault's loop'''. A lesion in the temporal lobe that results in damage to Meyer's loop causes a characteristic loss of [[Visual perception|vision]] in a superior quadrant.
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==Additional images==
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<gallery>
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Image:Telencephalon-Horiconatal.jpg|Horizontal section of right cerebral hemisphere.
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Image:Gray746.png|Diagram of the tracts in the internal capsule.
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</gallery>
   
:* The fibers from the superior retina travel straight back to the [[occipital lobe]] in the [[internal capsule|retrolenticular limb of the internal capsule]] to the visual cortex. They carry information from the inferior part of the visual field and, taking the shorter path, are less susceptible to damage.
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==External links==
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* {{eMedicineDictionary|Optic+radiation}}
   
 
{{Visual_system}}
 
{{Visual_system}}
 
{{Sensory_system}}
 
{{Sensory_system}}
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{{neuroscience-stub}}
   
 
[[Category:Nervous system]]
 
[[Category:Nervous system]]

Latest revision as of 09:19, February 18, 2007

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Brain: Optic radiation
Gray753
Deep dissection of cortex and brain-stem. (Optic radiation labeled at center left.)
Right superior quadrantanopia
Right superior quadrantanopia. The areas of the visual field lost in each eye are shown as black areas. This visual field defect is characteristic of damage to Meyer's loop on the left side of the brain.
Latin radiatio optica
Gray's subject #
Part of
Components
Artery
Vein
BrainInfo/UW ancil-529
MeSH [1]

The geniculo-calcarine tract (also known as the optic radiation) is a collection of axons from relay neurons in the lateral geniculate nucleus of the thalamus carrying visual information to the visual cortex (also called striate cortex) along the calcarine fissure. There is one such tract on each side of the brain.

PartsEdit

A distinctive feature of the optic radiations is that they split into two parts on each side:

  • The fibers from the inferior retina must pass into the temporal lobe by looping around the inferior horn of the lateral ventricle. These fibers, which carry information from the superior part of the visual field, are called Meyer's loop or Archambault's loop. A lesion in the temporal lobe that results in damage to Meyer's loop causes a characteristic loss of vision in a superior quadrant.

Additional imagesEdit

External linksEdit

Sensory system - Visual system - edit
Eye | Optic nerve | Optic chiasm | Optic tract | Lateral geniculate nucleus | Optic radiation | Visual cortex
Nervous system - Sensory system - edit
Special sensesVisual system | Auditory system | Olfactory system | Gustatory system
Somatosensory systemNociception | Thermoreception | Vestibular system |
Mechanoreception (Pressure, Vibration & Proprioception) | Equilibrioception 



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