optic chiasma

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optic chiasma

The optic chiasma is where the optic nerves cross in the brain.

Definition
  1. Noun:
    • The crossing of the optic nerves from the two eyes at the base of the brain: The optic chiasma is a specific anatomical structure where the optic nerves partially cross. This crossing allows visual information from each eye to be processed by both hemispheres of the brain.
Usage
  • The term "optic chiasma" is used exclusively in anatomical, medical, and biological contexts to describe this precise neural structure.
  • It is a singular noun. The plural form is "optic chiasmata" or, more commonly, "optic chiasms."
Examples
  • Noun:
    • The surgeon was careful to avoid damaging the patient's optic chiasma during the procedure.
    • A tumor pressing on the optic chiasma can cause specific visual field defects.
    • In human anatomy, the optic chiasma is located just below the hypothalamus.
Advanced Usage
  • "Lesion at the optic chiasma": Refers to damage or an abnormality at the site of the optic chiasm, often discussed in neurology and ophthalmology.
    • The MRI revealed a small lesion at the optic chiasma, explaining the patient's bitemporal hemianopia.
Variants and Related Words
  • Optic chiasm (n): A more common variant term with identical meaning.
  • Chiasma (n): The general term for an X-shaped crossing or intersection, especially of nerves or chromosomes. The optic chiasma is a specific type of chiasma.
  • Optic tract (n): The neural pathway that continues from the optic chiasma to the brain's visual centers.
Synonyms
  • Chiasma opticum: The Latin-derived anatomical term.
  • Optic decussation: A less common synonym emphasizing the crossing (decussation) of the nerve fibers.
Related Terms and Concepts
  • Visual field defect: A loss of part of the normal field of vision, which can result from pressure on the optic chiasma.
  • Bitemporal hemianopia: A specific visual field defect where the outer halves of the visual field from both eyes are lost, classically associated with damage to the central portion of the optic chiasma.
optic chiasma

The optic chiasma is where the optic nerves cross in the brain.

Noun
  1. the crossing of the optic nerves from the two eyes at the base of the brain

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