WordNet

a brief treatise on a subject of interest; published in the form of a booklet (同)pamphlet
an extended area of land (同)piece of land, piece of ground, parcel of land, parcel
a system of body parts that together serve some particular purpose
a drawing created by superimposing a semitransparent sheet of paper on the original image and copying on it the lines of the original image (同)trace
the act of drawing a plan or diagram or outline
the discovery and description of the course of development of something; "the tracing of genealogies"

PrepTutorEJDIC

広大な土地(地域),(土地・海・空などの)広がり《+of+名》 / (器官の)管,(神経の)索
(おもに宗教・政治などの宣伝用の)小冊子,パンフレット
跡を追うこと,追跡;透写,複写 / 〈C〉 / 透写(複写)によってできたもの(地図・図案など),透写図

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/02/06 23:03:57」(JST)

wiki en

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

Wikimedia Commons has media related to: Optic radiation

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

This neuroscience article is a stub. You can help Wikipedia by expanding it.

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

1. 同名半盲 homonymous hemianopia
2. 気腫性尿路感染症 emphysematous urinary tract infections
3. 総胆管損傷の修復 repair of common bile duct injuries
4. 妊娠中の尿路感染症および無症候性細菌尿 urinary tract infections and asymptomatic bacteriuria in pregnancy
5. 腹腔鏡下胆嚢摘出術の合併症の内視鏡マネージメント endoscopic management of complications from laparoscopic cholecystectomy

English Journal

Geniculocalcarine tract disintegration after ischemic stroke: a diffusion tensor imaging study.

Zhang Y1, Wan S, Zhang X.
AJNR. American journal of neuroradiology.AJNR Am J Neuroradiol.2013 Oct;34(10):1890-4. doi: 10.3174/ajnr.A3535. Epub 2013 May 2.
BACKGROUND AND PURPOSE: Our aim was to investigate the disintegration of the geniculocalcarine tract by using DTI-derived parameters in cases of unilateral occipital or temporal-occipital ischemic stroke with geniculocalcarine tract involvement and to determine whether geniculocalcarine tract fibers
PMID 23639556

Intraventricular meningiomas: a consecutive series of 22 patients and literature review.

Ødegaard KM1, Helseth E, Meling TR.
Neurosurgical review.Neurosurg Rev.2013 Jan;36(1):57-64; discussion 64. doi: 10.1007/s10143-012-0410-5. Epub 2012 Jul 31.
Intraventricular meningiomas (IVMs) are rare tumors of which the majority is located in the lateral ventricles. Most published series on the subject includes only a few patients. We analyzed our series of IVMs with a special interest in clinical features, outcome, and complications related to surger
PMID 22847766

Diffusion tensor imaging reveals normal geniculocalcarine-tract integrity in acquired blindness.

Zhang Y1, Wan S, Ge J, Zhang X.
Brain research.Brain Res.2012 Jun 6;1458:34-9. doi: 10.1016/j.brainres.2012.04.012. Epub 2012 Apr 17.
We investigated optic nerve and geniculocalcarine tract (GCT) in acquired blindness (AB) using routine cranium magnetic resonance imaging and diffusion tensor imaging. Twenty individuals with AB were compared with 20 normally sighted (NS) individuals. The transverse diameters of optic nerves in NS w
PMID 22560504

Related Pictures

VISION - Neurophysiology - Physiology 5th Ed. Virtual Course: Elements of neuro-ophtalmologic examination - RONOS Special Senses and their Neural Pathways - Textbook of Clinical Neuroanatomy, 2 ed. PPT - Cranial nerves II,III, IV,VI and Visual Pathway PowerPoint Presentation - ID:1758028 Geniculocalcarine tract (optic radiation), axial view. A-D, | Download Scientific Vision - Ganong’s Review of Medical Physiology, 24th Edition