We are talking about Urshiro which is sixth sense.
in shizenkai we have a whole set of throws that are Urshiro waza which consist of the tori attacking behind the back. if you wanna learn a great recorse to chakras ( it may not be a jappaness expression) I strongly reccomend sacred science by Norman Paulson. you can order it at
It really is a comprehensive book about the chakras and what they do. it also explaains a meditation tecqnige which is good to. well gotta hit the hay.