Why is it that a spinal cord can not heal at all after an accident?
Answers:
The spinal cord can heal to some extent in some cases, but it depends on the severity. For instance, Christopher Reeve had a severe spinal cord injury, termed "complete" or ASIA Class A with very little chance of meaningful recovery. However, in some less severe cases there is a chance of significant recovery. There are cases of people initially paralyzed completely from the neck down who, after recovery, can walk. However, in virtually all these cases, these patients had, at the time of initial preservation, at the very least some sensation below the level of injury indicating an "incomplete" lesion. For more information, try the American Spinal Injury Association (ASIA).
it has been found that cells from the nervous system cannot undergo replication. they are active in the growth stage as to adjust to the size of human body. but beyond that, nerve cells lose their ability to divide and multiply since the hormones required for this become depleted. unlike other body cells, their ability to reproduce is lost much earlier. this also explains why we age. as we get older, our bodies cellular replenishing slows down, this accounts for wrinkles and drying up.. shutting down of other bodily functions. just like a car, our bodies wear out sometime, but the ability to fix the nervous system goes out quicker
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