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optic chiasma
(redirected from optic chiasm)

   Also found in: Dictionary/thesaurus, Medical, Wikipedia 0.01 sec.
optic chiasma [′äp·tik kī′az·mə]
(neuroscience)
The partial decussation of the optic nerves on the undersurface of the hypothalamus.


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Patients may have symptoms due to compression of adjacent structures, particularly the optic chiasm and optic nerves.
The etiologies of their visual impairments included retinopathy of prematurity, glaucoma, retinal detachment, amaurosis, optic chiasm tumors, sarcoid growth, injury, retinitis pigmentosa, diabetic retinopathy, retinal blastoma, macular degeneration, and unknown.
A control magnetic resonance study revealed dilation of the ventricles, bilateral thinning of the optic nerves, and prominent atrophy on the right side of the optic chiasm (Fig.
 
 
 
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