Is there any way for a human to protect themself from the dreaded Vulcan nerve pinch? Apparently the only humans to remain conscious through a Vulcan nerve pinch are those who have been genetically altered. Could just wearing a neckguard help perhaps?
The nerve pinch is, and I don't know if this is purely accidental, close to the sinoatrial node in the neck that regulates the blood flow to the brain. From my experience in martial arts, I am aware that hitting the correct point can immobilize an opponent. A vulcan nerve pinch is IMHO (and I am have no degree in medicine, biology or anything similar) simply a more sophisticated version of hitting that nerve. So, I'd say, there is no biological defence against and you'd need an armour (e.g. a medival neck plate) to protect from it.
I am also not aware of any nerve pinch being executed somewhere else than the neck.