Zhong, middle; zhu, a plot of small land in water.
The point is in the middle of the Five-Shu points and the Qi of meridian flows like water along the water margin.
(Fist made) in the posterior depression between 4th and 5th matacarpal ophalangeal joint.
Swelling and pain of the throat, deafness, tinnitus, stiff neck.
Perpendicularly 0.3-0.5 cun.