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lateral column of spinal cord

n.
  1. A slight protrusion of the gray matter of the spinal cord into the lateral funiculus of either side, especially in the thoracic region where it encloses preganglionic motor neurons of the sympathetic division of the autonomic nervous system.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.