chiasma
noun
a crossing or decussation, as that of the optic nerves at the base of the brain.
chiasm
-
a variation of
chiasma.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Visual information travels along the optic nerve to a structure called the optic chiasm.
From Science Daily ● Nov. 4, 2026
Scientists could examine fossilized skulls from ancient jawless fish for anatomical evidence that might help establish whether these early animals possessed an optic chiasm and optic tectum.
From Science Daily ● Nov. 4, 2026
Hazel has an optic chiasm pilocytic astrocytoma - a slow-growing tumour which presses on her optic nerve and affects her vision.
From BBC ● Jan. 19, 2026
The axons that decussate in the chiasm are from the medial retinae of either eye, and therefore carry information from the peripheral visual field.
From Textbooks ● Jun. 19, 2013
The visual field is projected onto the two retinae, as described above, with sorting at the optic chiasm.
From Textbooks ● Jun. 19, 2013
