Vertically 0.5–1 cun.
Caution: Peritoneum, pregnancy
The Penetrating Vessel is the 'Sea of Blood', 'Sea of the 12 Channel' as well as the 'Sea of the abdomen avenue'. Thus its points are often able to invigorate the Blood and Qi and remove Stagnation, especially in the abdomen.
For Shiguan KID-18, it can remove the malign blood that stagnates in the Uterus after childbirth. It also invigorates Qi and Blood in the abdomen and the lateral costal region, so as to ease severe pain. It is also useful for many other gynecological disorders.
On the other hand, it also harmonizes the Stomach and treats symptoms such as hiccup, vomiting, retching, much spittle and inability to open the mouth.