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[dee-kuh-sey-shuh n, dek-uh-] /ˌdi kəˈseɪ ʃən, ˌdɛk ə-/
a process of becoming or condition of being crossed in the form of an X .
Anatomy. a nerve or tract of nerve fibers that crosses from one side of the central nervous system to the other.
Origin of decussation
1650-60; decussate + -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for decussation
  • Within the chiasma, the optic nerves undergo a partial decussation.
  • The optic chiasma is formed by the meeting and partial decussation of the fibers of the two optic nerves.
decussation in Medicine

decussation dec·us·sa·tion (děk'ə-sā'shən, dē'kə-)

  1. A crossing in the shape of an X.

  2. An X-shaped crossing, especially of homonymous nerves or bands of nerve fibers, connecting corresponding parts on opposite sides of the brain or spinal cord.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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