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thoracic nucleus

n.
  1. A column of large neurons located in the base of the posterior gray column of the spinal cord, extending from the first thoracic through the second lumbar segment, and giving rise to the dorsal spinocerebellar tract of the same side.dorsal nucleus
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.