"Because of stimulation to abdomen artery and nerves by the severe shock of small intestines and bladder and severe change in blood circulation and loss of motor organ."
That is a target and quote from Hohan Sokens notes (Controversy Here), where he describes the Target Location, the Tools for attack and the results.
These notes are not for the pressure point KO's you see today, but rather to seriously injure or kill the opponent. That makes the notes a collection of illegal procedures we urge you not to use... so why bother is a question that may arise if you can not even practice them?
Well this is just one of a collection of Kyusho targets that have been explained in medical terms as well as given a more viable modern adaption that eliminates the concern mentioned above.