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posterior scalene muscle in Medicine

posterior scalene muscle

n.
  1. A muscle with origin from the fourth to the sixth cervical vertebrae, with insertion into the second rib, with nerve supply from the cervical and brachial plexuses, and whose action elevates the second rib.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.