Why Do Tracts Decussate?

Conclusion: Decussation evolved as a byproduct of a genetically determined partial inversion of the body plan, which resulted in a 180 degree rotation posterior to the brain and oropharynx.

Do most spinal tracts Decussate?

Most of the axons of the anterior corticospinal tract will decussate in the spinal cord just before they synapse with lower motor neurons.

What does decussation of the spinal tracts mean?

Descending tracts are the pathways by which motor signals are sent from the brain to the spinal cord. They are also called motor tracts, due to their involvement in movement coordination. ... Extrapyramidal tracts – originate in the brain stem; carry motor fibers to the spinal cord.