Final answer:
The lateral funiculus is the white matter region on each lateral side of the spinal cord, part of the spinal cord's columnar organization.
Explanation:
The white matter region on each lateral side of the spinal cord is the lateral funiculus. The white matter in the spinal cord is divided into columns where the lateral column lies between the dorsal and ventral columns. These columns contain axons either ascending toward the brain or descending toward spinal nerves.
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