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optic chiasm
This term is a specialized anatomical designation used primarily in medical, biological, and neurological contexts. It describes a specific physical junction rather than a general process, making it a technical term of art. Because it refers to a unique, singular anatomical structure in the human brain, it is almost exclusively used in the singular form.
In clinical settings, the term is frequently associated with discussions of visual field defects, such as bitemporal hemianopia, which occurs when a lesion or tumor compresses the structure. It is distinct from the optic nerves themselves, representing the specific point of decussation where nerve fibers cross.
Meanings
Examples
The optic chiasm is where the optic nerves cross over in the brain.
A pituitary tumor can compress the optic chiasm and cause vision loss.
Look at the diagram to see how the fibers decussate at the optic chiasm.
The patient presents with bitemporal hemianopsia due to a lesion at the optic chiasm.
I wonder if the pressure on the optic chiasm is causing these blind spots.
The optic chiasm sits just above the sella turcica.
We need to check for any inflammation around the optic chiasm.
The nasal fibers cross at the optic chiasm while temporal fibers remain ipsilateral.