And in Cleveland (I knew that place was shady) in the '70s a neurosurgeon named Robert White severed the head of one monkey and connected it to the body of another decapitated one. PETA would be very, very disappointed.
Why not humans? According to Robbie (still alive I believe)? Possible. Of course, the technology does not exist to reconnect spinal cords. This means any person benefiting from the surgery would still be paralyzed from the neck down. Hey, you can’t have everything. Where the hell did I read this? Mary Roach's Stiff: The Curious Lives of Human Cadavers. Worth a read.