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 Volume 64, Number 8, April 26, 2005
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NEUROLOGY 2005;64:1438-1440
© 2005 American Academy of Neurology
Brief Communications

Somatotopically located motor fibers in corona radiata: Evidence from subcortical small infarcts

Jong S. Kim, MD and Amy Pope

From the Department of Neurology (Dr. Kim), University of Ulsan, Asan Medical Center, Seoul, South Korea; and Edinburgh University (A. Pope), Edinburgh, Scotland.

Address correspondence and reprint requests to Dr. Jong S. Kim, Department of Neurology, Asan Medical Center, Song-Pa, PO Box 145, Seoul 138-600, South Korea; e-mail: jongskim{at}amc.seoul.kr

Using T2-weighted MRI, we measured the relative anteroposterior distance of small corona radiata infarcts in 54 patients who had disproportionate weakness in the bulbar (Group A), arm (Group B), and leg (Group C) muscles. The lesions were differently (p < 0.01) located: Group A, most were located anteriorly; Group B, most were in the middle; and Group C, most were located posteriorly. These results suggest that motor fibers are somatotopically arranged in the human corona radiata.

Supported by a grant (M103KV010005 03K2201 00540) from Brain Research Center of the 21st Century Frontier Research Program funded by the Ministry of Science and Technology.

Received August 4, 2004. Accepted in final form December 28, 2004.




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