there is a huge amount of mostly automated information processing systems outside of the brain... you may have heard the expression "muscle memory"

well there is also other types that relate to telemetry and control systems for organs...

for example, it can happen that you get pain in a part of your abdomen and this is from those nerves signalling a problem, and the signal "bleeds" across into other nerves and sends a signal - this happens often to trigger, for example, diaphragm muscles to cramp and it's not from strain on the muscle it's from this bleed-through

that huberman guy talks about this, youtube podcaster neurologist