decussation

[dee-kuh-sey-shuhn, dek-uh-]
noun
1.
a process of becoming or condition of being crossed in the form of an X .
2.
Anatomy. a nerve or tract of nerve fibers that crosses from one side of the central nervous system to the other.

Origin:
1650–60; decussate + -ion

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World English Dictionary
decussate
 
vb
1.  to cross or cause to cross in the form of the letter X; intersect
 
adj
2.  in the form of the letter X; crossed; intersected
3.  botany (esp of leaves) arranged in opposite pairs, with each pair at right angles to the one above and below it
 
[C17: from Latin decussāre, from decussis the number ten, from decem ten]
 
de'cussately
 
adv
 
decus'sation
 
n

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American Heritage
Medical Dictionary

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

  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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Example sentences
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.
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