Definition

1. Noun:
   • The crossing of the optic nerves from the two eyes at the base of the brain: The "chiasma opticum" 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 "chiasma opticum" is used exclusively in technical, medical, and biological contexts to describe this precise neural structure. It is a formal, scientific term.

Examples

• Noun:
  • The surgeon carefully avoided the chiasma opticum during the procedure.
  • Damage to the chiasma opticum can cause specific visual field deficits.
  • The anatomy textbook included a detailed diagram of the chiasma opticum.

Advanced Usage

• "Lesion at the chiasma opticum": Refers to damage or an abnormality located at this specific neural crossing point.
  • The MRI revealed a lesion at the chiasma opticum.

Variants and Related Words

• Optic chiasm (n): The most common English synonym for "chiasma opticum". It is used interchangeably in medical literature.
  • The optic chiasm is a crucial structure for binocular vision.
• Chiasma (n): A more general term for an X-shaped crossing or intersection, especially of nerves or chromosomes. "Chiasma opticum" is a specific type of chiasma.
  • Genetic recombination involves the formation of a chiasma between homologous chromosomes.

Synonyms

• Optic chiasm: The direct and most frequently used synonym.
• Optic commissure: A less common but technically accurate synonym referring to the point of crossing.

Related Terms and Concepts

• Hemianopia (n): A type of visual field loss often associated with damage to the optic chiasm.
  • A tumor pressing on the chiasma opticum can lead to bitemporal hemianopia.
• Decussation (n): The general anatomical term for a crossing over of nerve fibers from one side of the body to the other. The "chiasma opticum" is a specific decussation.
  • The chiasma opticum is an example of a partial decussation of sensory pathways.

Noun

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