Somewhere I was reading someone's story who had been slapped in back of his neck very strongly and he had pain and was afraid of getting paralyzed.
After reading his whole conversation with a doctor, a small question popped into my head. They were both saying it *slap in back of neck or slap to the back of neck*.
Can't we simply say it "A slap on the neck" without "back"?
Like: He slapped his kid on his neck!
(It's a really harsh thing to do, though)