Discussions of target areas, like “pressure points,” can sometimes be a subject of controversy regarding effectiveness, as in the case of secret or hidden techniques. Some, on the other hand, are indisputably effective. Such is the “Brachial Stun” or a strike to the side of the neck.
Let’s look at a couple of good examples.
Example #1: Highlights of Mirko "Cro Cop" Filipovic, a former kickboxer, and currently an MMA fighter, known for his knockout prowess. Notice that the Thai kick applied to the temple or the side of the neck, when landed flush, almost always results in a knockdown. Ironically, Cro Cop himself was defeated in the UFC via the same technique.
Example #2: The Famous “Pimp Smackdown” video. In this case, the attacker is hit cleanly to the side of the neck by the “Karate expert” with a forearm or knifehand strike to obvious effect. Also notice that the Karate man was not planted to deliver maximum power, but snapped the technique while also penetrating through the target. If he were "planted” or had a stronger base, I doubt the pimp would have been able to stumble away at all.
So what is the Brachial Stun? An older version of the Army Field Manual on combatives (FM 21-150) describes it this way,
A sharp blow to the side of the neck causes unconsciousness by shock to the carotid artery, jugular vein, and vagus nerve. For maximum effect, the blow should be focused below and slightly in front of the ear. A less powerful blow causes involuntary muscle spasms and intense pain. The side of the neck is one of the best targets to use to drop an opponent immediately or to disable him temporarily to finish him later.
Clearly, the goal in FM 21-150 was to put an opponent down quickly, and this technique does. That’s why it’s become a staple of police defensive tactics and almost all combatives (military hand-to-hand use or based) systems.
CAUTION: This is for informational purposes only. Any strike that can drop or disable an opponent may result in unconsciousness or death, even by a secondary impact (the floor or another object).