optic chiasma


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Related to optic chiasma: corpus callosum, optic tract

optic chiasma

n.
A structure in the brain formed by the partial intersection or crossing of the optic nerve fibers on the underside of the hypothalamus. Also called optic chiasm.

op′tic chias′ma

(or chi′asm),


n.
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.
[1870–75]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.optic chiasma - the crossing of the optic nerves from the two eyes at the base of the brain
chiasm, chiasma, decussation - an intersection or crossing of two tracts in the form of the letter X
References in periodicals archive ?
It was causing suprasellar extension and abutment of optic chiasma.
Magnetic resonance imaging (MRI) of the sellar area revealed a large intrasellar mass with a dimension of 15x14x12mm that extended to the suprasellar cisterns, with thickening of the infundibular stalk and elevating optic chiasma.
In another study on neuroepithelial cells migration in mice subsequent poisoning with vincristine during pregnancy has been expressed that this drug can cause abnormalities in the cephalic fold and optic chiasma which is seen from blight to Asymmetric growth [17].