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Yin Wei Mai (Yin Linking Vessel) links with the Yin meridians and serves as the convergence point for all Yin meridians. It connects with Yang Wei Mai (Yang Linking Vessel) throughout the body. If Yin cannot link with the Yin meridians, one will feel despondent and lose their will. The meridian originates at Zhubin (KI5, Zhubin), an acupoint of Foot-Shaoyang Gallbladder Meridian, meets Foot-Taiyin Spleen Meridian at Fuai (SP16, Fuai) and Dahan (SP17, Dahan) in the spleen region; meets Hand-Taiyin Lung Meridian and Foot-Jueyin Liver Meridian at Fushu (SP16, Fushu - *Note: Text says Fushu but location implies SP16 or GB26 area contextually, sticking to text name*) in the spleen region and Qimen (LR14, Qimen) in the liver region; and meets Ren Mai (Conception Vessel) at Tiantu (CV22, Tiantu) and Lianquan (CV23, Lianquan) on the Conception Vessel. Its manifestations include suffering from heart pain.

The classic states: What are the "extraordinary" and "constant" pulses? Generally, human Qi and Blood normally circulate within the Twelve Regular Meridians. If the regular meridians are full and overflowing, the excess flows into the Extraordinary Vessels. Among these eight vessels, Ren Mai (Conception Vessel) governs the anterior aspect, Du Mai (Governing Vessel) governs the posterior aspect, Dai Mai (Girdle Vessel) binds the middle, Chong Mai (Penetrating Vessel) is the sea of all vessels, Yang Wei Mai (Yang Linking Vessel) links and maintains the Yang meridians, Yin Wei Mai (Yin Linking Vessel) links and maintains the Yin meridians, Yang Qiao Mai (Yang Heel Vessel) originates from the branch of Taiyang, and Yin Qiao Mai (Yin Heel Vessel) originates from the branch of Shaoyin. This is like sages digging canals to prepare waterways to prevent flooding. Therefore, the eight vessels are compiled into one chapter for reference.

[Neijing Tu Image omitted]

Old diagrams showed a Jing Dao (Essence Channel) following the spine, passing through the anus, which is highly unreasonable, and lacked images of the Zi Gong (Uterus) and Ming Men (Gate of Life). These were major errors and have now been corrected.
The Xin Xi (Heart Connection) corresponds to seven vertebral segments. Beside the seventh segment lies the Xiao Xin (Lesser Heart). The Shen Xi (Kidney Connection) attaches below the fourteenth vertebra; counting upwards from below, it also spans seven segments.

I have calculated that the root of human life lies in Yuan Qi (Original Qi); the Yin and Yang of the interior and exterior rely on Sheng Jiang (Ascending and Descending) and Chen Fu (Sinking and Floating) for regulation; Chu Ru (Entering and Exiting) and Yun Ying (Circulation and Operation) cycle continuously; Shen Ji (Spirit Mechanism) and Qi Li (Qi Establishment) ensure endless generation and transformation. Jing Luo (Meridians and Collaterals) travel along the muscle surface, while Zang Fu (Zang and Fu Organs) connect to the throat. The Hou (Throat/Pharynx proper) is at the front, firm and strong in form; the Yan (Oropharynx/Esophagus entrance) is at the back, gentle and soft in quality. The Hou governs respiratory Qi, which circulates through the Five Zang Organs; the Yan is the pathway for food and drink, the source of the Six Fu Organs. How can Qi and Food not be chaotic? The Hui Yan (Epiglottis) acts as the master of diversion. From there, entering the Yan and passing through the Diaphragm, the Yin and Yang of the Zang and Fu differ. Among the Five Zang Organs, Fei (Lung) is the Hua Gai (Canopy), connecting upward to the throat tube; below the Fei, protected by Xin Bao (Pericardium), the Jun Zhu (Monarch/Heart) can be sought. This is Dan Zhong (Chest Center/Shanzhong), where Zong Qi (Gathering Qi) originates. The Ge Mo (Diaphragm) surrounds and shields, forming a clear and empty upper palace. Pi (Spleen) resides below the diaphragm, in the Central Province, sharing space with Wei (Stomach); membranes connect to the left of the Stomach, enabling transformation and transportation functions. The Gan Ye (Liver Leaf) shields behind the Spleen, and Dan Fu (Gallbladder) attaches to the east side of the leaf. The two Shen (Kidneys) reside below the spine, connected by meridians in the waist, governing the root of closure, storage, and sealing, and serving as the patriarch of the Two Yin and Tian Yi. This belongs to the anterior orifice of the throat, where Spirit relies on Qi for nourishment. As for the Six Fu Organs, Yangming Wei (Stomach) comes first, ripening and rotting water and grain. The Wei Wan (Stomach Body) connects to the throat, its upper opening called Ben Men (Cardia), where Gu Qi (Grain Qi) scatters and spreads, transporting to the Spleen Meridian and reaching the Lung, truly being the great source of the Lung and Fu organs. Passing through the lower opening of You Men (Pylorus), it connects to the Xiao Chang (Small Intestine) and spirals. Further down at the lower limit of the Small Intestine lies Lan Men (Valve/Ileocecal Valve). This is the pass for separating clear from turbid, distinguishing clarity and turbidity between front and back. Da Chang (Large Intestine) connects to its right, guiding dregs and filth out through the stool; Pang Guang (Bladder) has no upper orifice, communicating downward through seepage and excretion. Admiring the harmony and smoothness of the Two Yin, all are natural results of Qi transformation. Detailing the Zang and Fu roughly complete, only San Jiao (Triple Burner) remains unmentioned, hailed as the lonely Fu, possessing general authority, taking form based on the Three Powers (San Cai) and imitating Heaven according to the Six Harmonies (Liu He). The Upper Jiao is like mist, dense with atmospheric vapor; the Middle Jiao is like fermentation vats, generating fresh Ying Xue (Nutritive Blood); the Lower Jiao is like a ditch, governing the unblocking of stagnation. Thus, the Upper Jiao governs retention without exiting, and the Lower Jiao governs exit like a river. Summarizing the locations of all Zang organs, distinguishing high and low categories. Seeking the coming and going of pulse Qi, how do they assist each other? With the Xin Zhu (Heart Master) as the Sovereign, maintaining the connection of all meridians. Therefore, anger stirs in the Heart, and Liver Fire follows in intensity. When desires arise, Kidney Jing (Essence) boils. Unresolvable bitter thoughts wither the Sheng Yi (Vitality) in the Spleen. Lung pulse becomes choppy and Qi sinks due to sorrow and grief in the heart. Only because meridians connect mutually can Qi reach from the Heart. Although all Zang organs return to the Heart, the upper part actually connects to the Lung. How is Lung Qi generated? Its root lies in the Spleen and Stomach. Relying on water and grain from the Ao Cang (Granary/Spleen-Stomach), it transforms fine essence into Qi. When Qi is vigorous, Essence is abundant; when Essence is abundant, Qi is strong. This is the root of the transformation source, hiding True Life within Kan (Water/Kidney). Although the reasons for Neijing (Inner Landscape) exist, one must still investigate the roots and shoots. Since it is said to be in front of the two Kidneys, and also behind the Bladder. Emerging from the upper left of the Large Intestine, residing below the right of the Small Intestine. What exactly is stored within? It accumulates the intersection of Kan and Li (Water and Fire), serving as the sea of generating Qi and the sinus of Original Yang. It opens Jing Xue (Essence and Blood) in the Zi Gong (Uterus) and governs the longevity or premature death of life. Calling it Ming Men (Gate of Life) is correct; calling it "Da Gen" (Great Root) is not false. If one could know that thunder sounds underground, then one would comprehend that spring light fills the universe.