the non-brain part of the nervous system stores information too. there are some parts that are a little brain as well, like the ones that control involuntary reflexes and stuff like orthostatic pressure control of blood vessels... and there is a wire from the brain directly to the heart as well, bypassing the spinal column, that's how someone can be paralysed from the neck down but not die (quite amazing how that even exists as a survival mechanism, and hints also at the idea that under some conditions the broken connection in the spine can repair)