So here’s a stupid “I really should go to bed” thought.

Imagine if destroying the brain did nothing to a zombie except give it a caved in skull? Lopping the head off doesn’t stop it either.

In order to kill the zombie you actually have to destroy the entire spinal colom because if it’s intact it can send signals to the muscles to keep going. The virus or magic or what-the-hell-ever animates the corpse doesn’t reside in the grey matter but in the nerves/muscles themselves.

It would make them that much more dangerous, that much more difficult to get rid of, and slightly more interesting than the typical textbook that everyone uses.