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The Chong Mai (Penetrating Vessel) originates at Henggu (CV12), runs alongside the navel, and its vast qi (Zong Qi, Pectoral Qi) distributes to Huangshu (KI16). It passes through Shangqu (KI15), Shiguan (KI14), Yindu (KI13), Tonggu (KI12), and Youmen (KI14), reaching the chest where it spreads and flows in parallel with the Ren Mai (Conception Vessel).

The measurement of acupoints on the Chong Mai is identical to that of the Foot-Shaoyin Kidney Meridian. Starting from Henggu (CV12) up to Youmen (KI14), each successive acupoint is spaced one cun apart vertically, and located five fen laterally from the midline.

[Note] The Chong Mai originates from the Qichong area of the Foot-Yangming Stomach Meridian and runs parallel to the Foot-Shaoyin Kidney Meridian at the "Street of Qi" in the abdomen. It is located five fen lateral to the midline of the navel and ascends. Starting from the Henggu (CV12) acupoint at the lower abdomen near the pubic symphysis, it ascends sequentially through Dahe (KI12), Qixue (KI13), Siman (KI14), Zhongzhu (KI15), Huangshu (KI16), Shangqu (KI15), Shiguan (KI14), Yindu (KI13), Tonggu (KI12), and Youmen (KI14), totaling eleven acupoints. Each acupoint is spaced one cun apart vertically, and five fen lateral to the midline.

[Commentary] Regarding the Ren Mai (Conception Vessel), Du Mai (Governor Vessel), and Chong Mai (Penetrating Vessel), the *Suwen: Gu Kong Lun* states: "The Ren Mai originates below Zhongji (CV3) and above the pubic hair line." This externally refers to the hypogastric region. "It follows inside the abdomen," this internally refers to the Baogong (Uterus/Essence Chamber). The Du Mai originates from the central bone below the hypogastric region; in women, it is the Tingkong (urethral opening); in men, it is the Yinqi (genitals). They converge at the Cuanyuan (perianal region), penetrate the spine, and connect to the Kidneys. This also externally refers to the hypogastric region and internally to the Baogong. The Chong Mai originates from the Qichong area and runs with the Foot-Shaoyin Meridian, also referring to the Baogong. Although not explicitly stated as originating from the Baogong, it indeed originates there. Thus, it is known that the Ren, Du, and Chong Mai all originate from the Baogong. However, these three meridians are transformed from postnatal water and grain essence. Stomach Qi emerges from the Qichong area, converges in the Baogong, and runs in parallel with the primordial true Qi moving between the kidneys to nourish the whole body. From this perspective, it is undeniable that the three meridians share a common source. Therefore, Wang Bing in his *Neijing Zhu*, the *Jiayi Jing*, and the *Zhenjiu Tujing* referred to the portion running along the back as the Du Mai; the portion ascending from the lower abdomen as the Ren Mai, also called the Du Mai. This is merely distinguishing names based on the yin-yang attributes of the back and abdomen. However, since the Chong Mai also originates from the Baogong and ascends with the Foot-Shaoyin Meridian, the Ren, Du, and Chong Mai are one source branching into three. Thus, the human body's distinction between front and back is like the heaven and earth's distinction between Zi and Wu (North-South axis); the front-back distinction of the Ren and Du Mai is like the division of Yin and Yang by the Two Solids (Taiji). The Baogong is a general term for the Dantian in both men and women. In women, it is called the Nüzibao (Female Uterus); in men, it is the Jingshi (Essence Chamber).