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.
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
If the pituitary gland develops a tumor, it can press against the fibers crossing in the chiasm.
From Textbooks ● Jun. 19, 2013
For example, the axons from the medial retina of the left eye cross over to the right side of the brain at the optic chiasm.
From Textbooks ● Jun. 19, 2013
Though the chiasm is helping to sort right and left visual information, superior and inferior visual information is maintained topographically in the visual pathway.
From Textbooks ● Jun. 19, 2013
A growth of the pituitary gland presses against the optic chiasm and interferes with signal transmission.
From Textbooks ● Jun. 19, 2013
