Final answer:
The corticospinal tract of the anterior funiculus crosses over via the pyramidal decussation. At the medullary-spinal border, fibers in the corticospinal tract cross over to the opposite side of the brain. The tract then separates into two parts, controlling different domains of the musculature.
Step-by-step explanation:
The corticospinal tract of the anterior funiculus crosses over via the pyramidal decussation. This is the defining landmark at the medullary-spinal border where most of the fibers in the corticospinal tract cross over to the opposite side of the brain. At this point, the tract separates into two parts, which have control over different domains of the musculature.