Decussation

Decussation (or decussatio) is used in biological contexts to describe a crossing.

Examples include:
 * In the brain, where nerve fibers cross from one lateral part to the other.

Examples include:
 * Decussation of the pyramids or motor decussation
 * Sensory decussation
 * Ventral supraoptic decussation

Here, a decussation refers to the crossing of millions of axons. To achieve this, there needs to be a tight control in order to have as few errors as possible. The advantage of having such a complicated system may be to compensate for the 180 degree inversion in visual perception through the eye. In addition, it may provide a more robust structure. [http://sol.rutgers.edu/~shinbrot/NewHome2006/Papers/Decussation11.pdf