system
Given the following post, respond as if you're commenting on Reddit:
human
If limb reattachment manages to fix nerves inside the severed limb, why can't the same be done for a severed spinal chord?

It seems that limb reattachment can fix nerves inside limbs, so why shouldn't the same be possible with a spinal chord? Maybe not restore full function, but perhaps at least enable the person to stand upright?
gpt
The peripheral nervous system consists of the nerves in your arms, legs, abdomen, etc. which can regenerate by use of Schwann cells. It takes a long time and nerves generally don't heal to the same capacity and effectiveness that they used to be.

The spinal cord and brain however are part of the central nervous system which lacks schwann cells and an ability to regenerate.

Some spinal cord injuries can partially heal if the cord is partially instead of full severed by teaching nerve impulses to get rewired through the unsevered section with intense physical therapy. Likewise, if the spinal cord is simply compressed or bruised, almost if not all function can be restored if physicians work quickly to decompress the nerves.