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optic chiasma

or optic chiasm

noun

  1. 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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Word History and Origins

Origin of optic chiasma1

First recorded in 1870–75
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Example Sentences

Pressure on the optic chiasma, for example by a tumour of the pituitary body, is associated with bilateral temporal hemianopsia.

The optic chiasma, where present, is involved in the floor of the thalamencephalon and forms a large, upwardly-projecting ridge.

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optic axisoptic disc