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The "Treatise on Wei Syndrome" states: The five zang organs can all cause Wei syndrome (flaccidity syndrome), why is this? (Wei refers to flaccidity and weakness of the limbs, rendering them unable to move.) The Lung governs the skin and hair of the body; the Heart governs the blood vessels of the body; the Liver governs the sinews (tendons and fascia) of the body; (Sinews here refer to the tendinous tissue located above the subcutaneous layer and beneath the muscle.) the Spleen governs the muscles of the body; the Kidney governs the bone marrow of the body. (Although each organ has its specific governance, the onset of Wei syndrome also corresponds to its respective governing organ.) Therefore, if Lung heat causes the lung leaves to become scorched and dry, the skin and hair will become weak, tight, and thin; over time, this leads to Wei Bi (flaccidity with inability to extend the legs). (Wei Bi refers to tendon contraction where the feet cannot be extended for walking. Lung heat transmits thermal pathogenic factors to the Kidney, hence this occurs.) If Heart qi is hot, the lower vessels become jue (rebellious) and ascend; ascending leads to deficiency in the lower vessels; deficiency generates Mai Wei (vessel flaccidity), characterized by a collapse of the pivotal joints making lifting difficult, and the shins becoming flaccid and unable to bear weight. (Excessive Heart heat causes fire to flare upwards exclusively. The Kidney meridian normally descends, but when fire is excessive and flares up, the Kidney meridian follows the burning fire and rebels upward. Yin Qi rebels, fire burns internally, reaches the upper jiao yang, and fails to remain in its lower position; Heart qi returns to the vessels, thus generating Mai Wei. Since Kidney qi governs the feet, the knee and ankle joints feel as if broken, the shin tendons are flaccid, and one cannot stand on the ground.) If Liver qi is hot, gallbladder juice leaks causing bitter taste in the mouth, and the sinews become dry. Dry sinews lead to tendon cramping and contraction, manifesting as Jin Wei (sinew flaccidity). (The Gallbladder wraps the Liver lobes, and its juice tastes extremely bitter; Liver heat causes gallbladder fluid to leak, resulting in a bitter taste. The Liver governs the sinews; heat causes the sinews to dry and contract, leading to Jin Wei.) If Spleen qi is hot, the Stomach becomes dry causing thirst, and the muscles become insensate, manifesting as Rou Wei (muscle flaccidity). (The Spleen and Stomach are connected by membranes; Spleen heat causes stomach fluids to leak, resulting in dryness and thirst. The Spleen governs the muscles; heat disturbs the flesh, causing muscle insensibility, leading to Rou Wei.) If Kidney qi is hot, the waist and spine become immobile, bones become withered, and marrow decreases, manifesting as Gu Wei (bone flaccidity). (The waist is the residence of the Kidney. Furthermore, the Kidney meridian ascends through the inner thigh, penetrates the spine, and connects to the Kidney; thus, Kidney heat renders the waist and spine immobile. The Kidney governs bone marrow; marrow heat causes bone withering and marrow depletion, leading to Gu Wei.) Why does treating Wei syndrome focus solely on the Yangming channel? The Yangming channel is the sea of the five zang and six fu organs. (Yangming refers to the Stomach meridian, which is the sea of water and grain.) It governs the moistening of Zong Jin (major sinews); Zong Jin governs binding the bones and facilitating joint movement. (Zong Jin refers to the strong tendons above and below the pubic bone in the genital region. They connect superiorly to the chest and abdomen, inferiorly to the hips and sacrum, pass through the back and abdomen, and reach the head and neck; hence, it is said that Zong Jin binds bones and facilitates joints. However, the waist is the major joint of the body, responsible for flexion and extension, so it is called the "joint mechanism".) Chong Mai (Penetrating Vessel) is the sea of the twelve regular meridians. (As stated in *Ling Shu*: "Chong Mai is the sea of the twelve meridians.") It governs the infiltration and irrigation of the cun gu (valleys between muscles); it combines with Yangming at Zong Jin. (Investigating this meaning, the firm tendons above and below the pubic bone and beside the umbilicus are the true Zong Jin. Chong Mai circulates along the abdomen, flanking the umbilicus, ascending 0.5 cun laterally from the umbilicus; Yangming Meridian also flanks the umbilicus, ascending 1.5 cun laterally from the umbilicus, with the Zong Jin meridian in the middle; thus, it is said to combine with Yangming at Zong Jin. As the sea of the twelve meridians, it governs the infiltration of the cun gu. Large muscle masses gather into bones, small gatherings into sinews.) Yin and Yang converge at Zong Jin, meeting at Qicheng (Stomach 30), with Yangming acting as their leader; they all belong to Dai Mai (Girdle Vessel) and are linked to Du Mai (Governor Vessel). (Zong Jin gathers, meeting within the pubic bone, descending from above, hence it is said that Yin and Yang converge at Zong Jin. Zong Jin flanks below the umbilicus, merging with the pubic bone; Yangming assists externally, Chong Mai resides in the middle; thus, it is said to meet at Qicheng, with Yangming as the leader. Qicheng refers to the area beside the pubic hair where pulses beat. Dai Mai originates from the hypochondrium, encircles the body once, and links to Du Mai. Du Mai originates from Guanyuan (Ren 4), circulating up and down the abdomen. Hence, it is said: "They all belong to Dai Mai and link to Du Mai." Du Mai, Ren Mai (Conception Vessel), and Chong Mai share the same origin but differ in course, so the classic text sometimes cites them interchangeably.) Therefore, when Yangming is deficient, Zong Jin becomes flaccid and relaxed; Dai Mai fails to draw/tighten; consequently, the feet become flaccid and unusable. (The Yangming meridian descends from Quepen (Lung 1) along the inner aspect of the breast, passes flanking the umbilicus, to reach Qicheng; its branch originates from the lower opening of the Stomach, circulates within the abdomen, descends to merge at Qicheng, then travels down the thigh, reaches Futu (Stomach 32), descends into the knee patella, runs down the lateral aspect of the leg, to the dorsum of the foot, entering the space between the toes; another branch diverges three cun below the knee, descending to the outer space between the toes. Thus, Yangming deficiency leads to flaccidity of Zong Jin, failure of Dai Mai to draw, and flaccidity/unusability of the feet.)