optic chiasm


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Noun1.optic chiasm - 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 ?
For intra-extracranial tumors in the anterior skull base, the anterior limit of ETA is the frontal sinus, and the posterior limit is the optic chiasm and the anterior communication artery.
The decussation or separation of optic nerve fibres at the optic chiasm means that the right hemifield is projected to the left striate cortex and the left hemifield is projected to the right striate cortex (see Figure 2).
After 30 months, radiographic imaging demonstrated a reduction and stabilization of the tumors in the optic chiasm, hypothalamus, and left optic nerve.
There was associated mass effect on the optic chiasm, and superolateral displacement of the bilateral internal carotid arteries.
From autopsy findings in acute demyelinating disease, the spinal cord and optic chiasm reveal patches of demyelination and axonal degeneration associated with necrosis and cavitation.
Anterior visual pathways include retina, optic nerves and optic chiasm and the involvement results in moderate to profound visual loss along with impaired colour vision and loss of pupillary reflexes.
Emotions are likely not humanoid and wearing trousers and getting in physical conflicts with one another behind our optic chiasm.
Twelve-year-old Poppy, from Tamworth, was diagnosed at 14 months old with Optic Chiasm Glioma, a brain tumour behind the eye, a condition which gave her a 50 per cent chance of survival.
The entire cyst was dissected carefully from the optic chiasm and cavenous sinus after Sylvian fissure dissection, but the calcified capsule of the cyst was removed subtotally.
The coalescence of multiple granulomas in the brain parenchyma can produce space-occupying lesions, most commonly in the optic chiasm, floor of the third ventricle, and pituitary stalk, but can occur anywhere in the CNS.
RADIOLOGIC DIAGNOSIS: Findings are consistent with persistent fetal vasculature syndrome (PFVS) of the right eye associated with microphthalmia, bilateral optic nerve and optic chiasm hypoplasia, and absence of the neurohypophysis.