Question

the term used to describe the crossing over of a tract to the side of the nervous system opposite to where the axons originated is
ascending crossovers.
decussation.
contralateral.
pyramidal tracts.
consensual tracts.

Explanation:

• Ascending crossovers: Not a standard term in nervous - system terminology for this specific crossing - over.
• Decussation: This is the correct term. It refers to the crossing of axons from one side of the nervous system to the opposite side.
• Contralateral: Refers to being on the opposite side but is an adjective, not the term for the crossing - over process.
• Pyramidal tracts: These are a type of neural tract (motor tracts), not the term for the crossing - over.
• Consensual tracts: Not a valid term in the context of nervous - system anatomy for this crossing phenomenon.

Answer:

B. decussation