Title says it. I have never questioned the idea of a “glass jaw” and have experienced it first hand. While it makes sense for a head injury to have side effects, what is it about the jaw that leads to K.O.’s?
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It depends on the direction of the punch. The quick and dirty explanation. The first thing is in layman’s terms. Some people are more susceptible to concussions depending on how “tightly” the brain is packed in the skull. I’m sure someone can explain that part better, but the less it can move around, the harder a hit you can take. Hence the glass jaw.
There are two types of concussions.
One is when you are hit head on. When the head snaps back, it takes time for the brain itself to catch up to the movement. Think of being in a car accident. The car stops but you keep moving until you hit something. The brain compresses inside of the skull leaving an empty space on the other side and then snaps back.
The second is a radial concussion. This happens when the hit makes your head spin. Again, the skull moves and it takes time for the brain to catch up.
The jaw itself is far from the spine, the anchor point, so when it is hit, the force is amplified more than it would be if you are hit closer to that anchor/pivot point.
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