Journal
NEUROSCIENCE
Volume 143, Issue 4, Pages 1041-1050Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuroscience.2006.08.057
Keywords
auditory cortex; corpus callosum; language; sex difference; minicolumn; association cortex
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Funding
- NIMH NIH HHS [R01 MH62654, R01 MH69] Funding Source: Medline
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Aim: To investigate the cytoarchitectural basis of asymmetries in human auditory cortex. Minicolumn spacing and number, and regional cortical volume and surface area were measured in the primary auditory region (Heschl's gyrus, HG) and posterior auditory association region (planum temporale, PT) in 17 neurologically normal adults (10 female, seven male). PT surface area, minicolumn spacing and mink column number were greater in the left hemisphere. HG surface area was larger in the left hemisphere. Asymmetries of minicolumn number in primary and association auditory regions correlated with axonal fiber numbers in the subregions of the corpus callosum through which they project. PT minicolumn number was more asymmetrical in men than women but total number was similar in the two sexes. We conclude that asymmetry of the surface area of the PT is a function of minicolumn spacing. Fewer callosal projections between the plana are found when the minicolumn spacing is more asymmetrical. (c) 2006 IBRO. Published by Elsevier Ltd. All rights reserved.
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