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 direct pupillary photomotor reflex absence in the right eye and indirect reflex absence in both eyes can be explained by the presence of the tumor mass extending from the adjacent ocular bulb portion to the optic chiasm (Figure 1B).
Caption: Figure 2: MRI (T1 weighted with contrast) one day after the surgery shows interval resection of the previously seen sellar mass/ hemorrhage and resolution of mass effect on the optic chiasm.
Unfortunately, neurosurgery could not be delayed due to mass effect of the underlying lung adenocarcinoma metastases on the pituitary and overlying optic chiasm. Had surgery been delayable, a far less invasive diagnostic test for T790M mutation could have been performed.
Rorke et al., "Gangliogliomas involving the optic chiasm," Neurology, vol.
Description of the Specific Measurements of the Optic Chiasm Position Relative to the Plane of the Diaphragm Sella.
In addition, the manipulation and retraction of the optic nerve and the optic chiasm are reduced by adopting a medial-to-lateral trajectory in ETA.
Abnormal crossing of the optic nerve fibres at the optic chiasm is also a common feature in albinism.
This viral CNTF expression has stronger effects on neuroprotection and axonal regeneration than those achieved via intravitreal injection, eliciting long-distance regrowth of axons up to the optic chiasm, but rarely beyond [1, 72].
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.
The MR imaging of this patient revealed a macroadenoma with a size of 3x3.5x3 cm compressing the left optic nevre and the optic chiasm on the left side.
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. Memories we can no longer retrieve have likely not been shoved over the edge of a cerebral cliff by a bulldozer.