WordNet

the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay (同)radioactivity
energy that is radiated or transmitted in the form of rays or waves or particles
the act of spreading outward from a central source
a radial arrangement of nerve fibers connecting different parts of the brain
the spread of a group of organisms into new habitats
optical properties; "the optics of a telescope"
the branch of physics that studies the physical properties of light

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〈U〉(光・熱・放射能などの)発散,放射 / 〈C〉放射物;放射線;輻射(ふくしゃ)熱 / 〈C〉(喜び・幸福感などの)発散《+『of』+『名』》 / =radioactivity
光学
(・・・を)選ぶ《+『for』+『名』》;(・・・するほうを)選ぶ《+『to』 do》
目の;視覚の

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/05/10 16:50:51」(JST)

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The optic radiation (also known as the geniculo-calcarine tract or as the geniculostriate pathway) 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.

Parts

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

Source	Path	Information	Damage
Fibers from the inferior retina (also called "Meyer's loop" or "Archambault's loop")	must pass through the temporal lobe by looping around the inferior horn of the lateral ventricle.	Carry information from the superior part of the visual field	A lesion in the temporal lobe that results in damage to Meyer's loop causes a characteristic loss of vision in a superior quadrant (quadrantanopia or "pie in the sky" defect.)
Fibers from the superior retina (also called "Baum's loop")	travel straight back through the parietal lobe to the occipital lobe in the retrolenticular limb of the internal capsule to the visual cortex.	Carry information from the inferior part of the visual field	Taking the shorter path, these fibers are less susceptible to damage.

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.

Additional images

Horizontal section of right cerebral hemisphere.
Diagram of the tracts in the internal capsule.
3D schematic representation of optic tracts

External links

Optic+radiation at eMedicine Dictionary
Kier LE, Staib LH, Davis, LM, Bronen, RA (1 May 2004). "MR Imaging of the Temporal Stem: Anatomic Dissection Tractography of the Uncinate Fasciculus, Inferior Occipitofrontal Fasciculus, and Meyer’s Loop of the Optic Radiation". Am J Neuroradiology 25 (5): 677–691. PMID 15140705. http://www.ajnr.org/cgi/content/abstract/25/5/677. Retrieved 2007-12-19.
http://www2.umdnj.edu/~neuro/studyaid/Practical2000/Q34.htm

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1. 同名半盲 homonymous hemianopia
2. 成人における詳細な神経学的検査 the detailed neurologic examination in adults
3. 視神経症 optic neuropathies
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5. 悪性神経膠腫に対する補助放射線療法 adjuvant radiation therapy for malignant gliomas

English Journal

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Surgical navigation, though well-established, is often associated with extra effort for both patient and surgeon, and with additional exposure to radiation as a result of the necessary extra imaging. Osteoblastoma is a benign bone tumour, malignant transformation of which is rare but possible, and s
PMID 20828896

The kinetics of herpes virus on the ocular surface and suppression of its reactivation.

Shimomura Y, Higaki S.SourceFrom the Faculty of Medicine, Kinki University, Osaka, Japan.
Cornea.Cornea.2011 Oct;30 Suppl 1:S3-7.
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PMID 21912227

Japanese Journal

Long-term effect of external beam radiotherapy of optic disc hemangioma in a patient with von hippel-lindau disease

Matsuo Toshihiko,Himei Kengo,Ishii Keita,Ichimura Kouichi,Yanai Hiroyuki,Nose Soichiro,Mimura Tetsushige
Acta Medica Okayama 65(2), 135-141, 2011-04
… She had optic disc hemangioma in the left eye which gradually enlarged and caused serous retinal detachment on the macula in one year. … Low-dose external beam radiation (20 Gy) was administered to the left eye using a lens-sparing single lateral technique. … In the 6-year follow-up period after the radiotherapy, the optic disc hemangioma gradually reduced in size and its activity remained low, allowing good central vision to be maintained. …
NAID 120002970770

Fractionated Stereotactic Radiation Therapy for Orbital Optic Nerve Sheath Meningioma-a Single Institution Experience and a Short Review of the Literature

PACELLI Roberto,CELLA Laura,CONSON Manuel,TRANFA Fausto,STRIANESE Diego,LIUZZI Raffaele,SOLLA Raffaele,FARELLA Antonio,SALVATORE Marco,BONAVOLONTA Giulio
Journal of radiation
… Optic nerve sheath meningioma (ONSM) is a rare orbital tumor that generally induces a slow progressive visual loss in affected patients. … Five patients with diagnosis of orbital ONSM were treated between April 2007 and December 2009 at the Radiation Oncology department of our institution. … In all patients pre-treatment MRI showed an orbital mass involving the optic nerve. …
NAID 10027418375