optic chiasma

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optic chiasma

[′äp·tik kī′az·mə]
(neuroscience)
The partial decussation of the optic nerves on the undersurface of the hypothalamus.
References in periodicals archive ?
The temporal fibres do not cross at the optic chiasm and project to the ipsilateral side of the visual cortex
In this patient, due to adherence to the vital structures, such as cavernous sinus and optic chiasm, we could not resect the capsule of the tumor totally to avoid possible additional neurologic complications.
Vimentin immunoreactivity (IR) was observed at the zone of the optic chiasm and the third ventricle of hypothalamus, in the supra optic nuclei (SO) and optic chiasm (OC) (Fig.
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.
The sella turcica is in close proximity to delicate vascular and neurologic structures, including the optic chiasm and cavernous sinus, as well as the third, fourth, and sixth cranial nerves and the ophthalmic and maxillary division of the fifth cranial nerve (Fig.
There may also be descent of the cerebellar tonsils, obliteration of prepontine, perichiasmatic cisterns, flattening of the optic chiasm, crowding of the posterior fossa, as well as decreased ventricular size, according to Dr.
Spasmus nutans has occasionally been associated with developmental abnormalities or optic chiasm gliomas, so a CT scan to rule these out should be obtained.
Charlie was just seven months old and Jack 18 months old, when doctors discovered the brain tumour, an optic chiasm glioma.
For example: "A group of low-grade glial tumors arising along the optic pathway, most frequently the optic chiasm .
While he demonstrated partial decussation of optic nerve fibres at the optic chiasm he erred regarding their union: fibres from corresponding points on the two retinas were represented as joining one another rather than remaining independent as far as the visual cortex.
Gliomas may involve the optic chiasm and lead to diminished visual field, headaches, and increased intracranial pressure.