decussation

/,dekʌ'seiʃn/

Thân thiện

The diagram shows the decussation of the optic nerves.

Definition

1. Noun:
   • An intersection or crossing of two tracts in the form of the letter X: In anatomy and neurology, it refers to a crossing point where nerve fibers or other structures from one side of the body pass to the opposite side, creating an X-shaped pattern.

Usage Examples

• Noun:
  • The optic chiasm is a well-known decussation in the brain where fibers from each optic nerve cross.
  • Damage to the pyramidal decussation can result in specific neurological deficits.

Advanced Usage

• "Site of decussation": A specific anatomical location where crossing occurs.
  • The medulla oblongata contains the site of decussation for the corticospinal tracts.

Variants and Related Words

• Decussate (verb): To intersect or cross in the form of an X.
  • The nerve fibers decussate at the midline.
• Decussatio (noun, Latin origin): The Latin term often used in formal anatomical names (e.g., ).

Synonyms

• Chiasm: A crossing, especially of nerves or tendons (often used interchangeably in anatomy, like ).
• Crossing: A more general term for a point where two things intersect.

Notes on Meaning

This is a specialized anatomical and neurological term. Its core meaning is the specific X-shaped crossing of pathways, most commonly applied to nerve tracts in the central nervous system. It is not used in everyday general language.

Học thuật

Noun

1. an intersection or crossing of two tracts in the form of the letter X

Từ đồng nghĩa

• chiasma
• chiasm