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optic chiasma

or optic chiasm

a site at the base of the forebrain where the inner half of the fibers of the left and right optic nerves cross to the opposite side of the brain.
Origin of optic chiasma
First recorded in 1870-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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optic chiasm in Medicine

optic chiasm n.
A flattened quadrangular body that is the point of crossing of the fibers of the optic nerves. Also called optic decussation.

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