Penetrating Vessel
The sea of blood and of the twelve meridians — a deep, upward current linked with reproduction.
Pathway
The Penetrating Vessel (衝脈, Chong Mai) is described as arising in the pelvic cavity and emerging at ST-30 Qichong. It ascends alongside the Kidney meridian on the abdomen and spreads through the chest. Classical texts also describe a descending branch to the feet.
It does not have a continuous line of its own points; instead it is treated through points on other meridians, especially SP-4 Gongsun, ST-30, and CV-4.
Role in TCM theory
- Sea of blood (血海) — The vessel is associated with blood, menstruation, and the uterus. In traditional gynecology it is central to patterns of deficiency and stagnation.
- Sea of the twelve meridians — The Ling Shu calls it the sea of the twelve meridians and of the five zang and six fu, a reservoir that regulates the channels.
- Upward momentum — Its classical image is a surging current that rises from the pelvis through the abdomen and chest.
- Rooted in the kidney — The vessel is closely related to kidney essence and to the body's constitutional reserves.
Key points associated with the vessel
| Point | Name | Location | Traditional use |
|---|---|---|---|
| SP-4 | Gongsun (公孫) | On the medial foot, in the depression distal and inferior to the base of the first metatarsal | The confluent point of the Penetrating Vessel; traditionally used for abdominal and digestive patterns |
| ST-30 | Qichong (氣衝) | Two cun lateral to the pubic symphysis, at the level of the upper border | Where the vessel is said to emerge; classically associated with the lower abdomen and reproductive system |
| CV-4 | Guanyuan (關元) | Three cun below the umbilicus | A major point for the vessel's blood and essence functions |
Point locations follow the WHO Standard Acupuncture Nomenclature (1991). The extraordinary vessels borrow points from the primary meridians; the table lists the points most closely associated with this vessel in standard references.
Confluent point
SP-4 Gongsun is the confluent point of the Penetrating Vessel; PC-6 Neiguan is its paired point on the Yin Linking Vessel. In clinical practice, the confluent point is the main point used when a practitioner wants to influence this vessel through acupressure or needling.
How this is viewed today
The Penetrating Vessel is difficult to study as an anatomical entity. Clinical research involving SP-4 and CV-4 often concerns digestive and gynecological symptoms, with small samples and mixed results. Lower-abdominal points should not be pressed during pregnancy or over an acute abdomen.
Sources & further reading
- Huangdi Neijing (黃帝內經), c. 2nd century BCE.
- Nanjing (難經), c. 1st–2nd century CE.
- World Health Organization, Standard Acupuncture Nomenclature, 2nd ed., 1991.
- Deadman P, Al-Khafaji M, Baker K. A Manual of Acupuncture. Journal of Chinese Medicine Publications.
- National Center for Complementary and Integrative Health, Acupuncture: What You Need To Know.
Related: Spleen meridian · Conception Vessel · Extraordinary vessels hub · acupoint library