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NEUROLOGY 1976;26:620
© 1976 American Academy of Neurology

Asymmetry of the lateral (sylvian) fissures in man

ALAN B. RUBENS, M.D., MARK W. MAHOWALD, M.D. and J. THOMAS HUTTON, M.D.

From the Department of Neurology, Hennepin County Medical Center, and University of Minnesota Medical School, Minneapolis, Minnesota.

We compared the courses of right and left lateral (sylvian) fissures by superimposing left lateral and reversed right lateral photographic slide projections and tracing the sulci and fissures of each hemisphere in different colors. A characteristic pattern of divergence of posterior regions of the lateral fissures was noted in 25 of 36 adult brains. After pursuing similar courses, the right lateral fissure angulates sharply upward into the inferior parietal area while the left one continues posteriorly. As a consequence, on the right, there is a smaller parietal operculum, a shorter planum temporale, a higher sylvian point, and compensatory expansion of the inferior parietal region posterior to the lateral fissure.

Dr. Rubens' address is Hennepin County Medical Center, 701 Park Ave., Minneapolis, MN 55415.

Presented in part at the twenty-seventh annual meeting of the American Academy of Neurology, Bal Harbour, Florida, April 1975.

This study was partly supported by National Institutes of Public Health Service, Cerebrovascular Research Center Grant NS-3364.

Received for publication July 11, 1975.




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