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definitions
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crus of diaphragm

n.
  1. Any of the muscular origins of the diaphragm from the bodies of the upper lumbar vertebrae that pass the aorta upward to the central tendon.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.