In MMA how is the back of the head defined?

Question

i,e where is the line drawn between a legal shot and a "rabbit punch"?

Answer 1

It used to be head phones but I think I also heard it is changed to "mohawk" no, so just the straight line down the head.

Answer 2

Think headphones....it's as if your opponent is wearing headphones, and you can't hit anything behind them. There ya have it!

Answer 3

Origionally it was anything behind the ears, there is a new rule going into effect that says it will now be a straight line going down the middle of the back of the head with one inch on each side. All hitting out of that zone will be ruled ok.