optic chiasma

or optic chiasm


noun

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.

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Origin of optic chiasma

First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Medical definitions for optic chiasm

optic chiasm

n.

A flattened quadrangular body that is the point of crossing of the fibers of the optic nerves.optic decussation
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.