The tail nerves only cover what is in the tail. If you break your back, you lose control of everything beyond the break. The lower the break the less impact. The last 4 vertebrae on the human spine are useless and sometimes called the tail bone. Leftover from our earlier mammal days.I've heard that the tail of an animal is an extension of the spine. Like extra vertebrae or whatnot. But if an animal tail breaks they don't become cripple like if it's the spine of a man. So what am I missing here in my thought process?