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Chapter 7 of 16
奇经八脉考
Holistic Paraphrase
This ancient medical text focuses on the pathological manifestations and classical treatment approaches for the Yin Qiao Vessel and Yang Qiao Vessel, two of the Eight Extraordinary Meridians. The Qiao vessels are described as vessels of "swiftness and agility," originating from the feet, and are closely related to bodily lightness, eyelid opening and closing, and sleep rhythms.
The ancients first cite the Classic of Difficulties (Nanjing): the yin collateral belongs to the Yin Qiao, and the yang collateral belongs to the Yang Qiao. When the Yin Qiao is diseased, there is typically relaxation on the yang side and spasmodic tightness on the yin side; when the Yang Qiao is diseased, the opposite occurs—relaxation on the yin side and tightness on the yang side. This pattern of "one side relaxed, one side tense" is the overarching characteristic of Qiao vessel disorders.
Wang Shuhe's Mai Jing (Pulse Classic) supplements the diagnostic picture with pulse examination 🩺: when the front segment of the cun-kou pulse (radial artery) rebounds left and right, it indicates Yang Qiao disease, with symptoms such as lumbosacral pain, epileptic seizures with rigid collapse, screaming like a goat, fear of wind, hemiplegia, arthralgia-numbness, and bodily rigidity. If the pulse is faint and rough, the ancients considered this wind-epilepsy and recommended needling the Fuyang point, located three cun above the lateral malleolus (ancient acupuncture and moxibustion method). When the rear segment of the cun-kou pulse rebounds left and right, it indicates Yin Qiao disease, with symptoms such as epilepsy with alternating chills and fever, migratory arthralgia-numbness of the skin, lower abdominal pain, internal urgency, pain from the lumbosacral region through the coccyx to the external genitalia—in men, yin hernia; in women, incessant morbid leukorrhea. For epileptic seizures with spasms that are difficult to localize, the ancients proposed needling "below the two Qiao vessels," selecting the Yang Qiao for men and the Yin Qiao for women.
Zhang Jiegu explains: Qiao means "swift and agile." The two vessels originate from the feet, enabling people to move with lightness and speed. The Yang Qiao travels above the muscles, connecting with the six yang organs and governing the exterior, hence called the yang collateral of the Yang Qiao. The Yin Qiao travels below the muscles, connecting with the five yin organs and governing the interior, hence called the yin collateral of the Yin Qiao. When Yin Qiao disease manifests predominately as spasmodic tension, there will be rigidity of the lower legs and blockage of the five collaterals—this is "exterior harmony with interior disease." When Yang Qiao disease manifests predominantly as hyperactivity and tension, there will be manic running and inability to close the eyes (insomnia)—this is "exterior disease with interior harmony." Ancient texts further mention: for yin-type conditions with heat, moxibustion 🔥 may be applied to Zhaohai (KI6) and Yanglingquan (GB34); for yang-type conditions with cold, acupuncture may be applied to Fengchi (GB20) and Fengfu (GV16). It is also stated that when the pathogen is in the exterior, diaphoresis should be induced; when in the interior, purgation should be employed. For epilepsy with daytime attacks, moxibustion is applied to the Yang Qiao; for nighttime attacks, to the Yin Qiao.
The Suwen · Treatise on Lumbago records that for lumbago where the patient cannot lift or extend the back, the ancients chose Shenmai (BL62) and Pucan (BL61), because they belong to the Greater Yang (Bladder) channel and constitute the origin of the Yang Qiao. There is also a type of lumbago caused by the "Meeting-Yin Vessel" (Huiyin), where the painful area sweats, thirst follows the drying of sweat, and the patient desires to walk after drinking. The ancients would needle three points on the "Direct Yang Vessel" (Zhiyang), located along the posterior aspect of the lower leg, and where congested blood vessels were visible, they would prick to let blood. Wang Bing's commentary states that "Meeting-Yin" is so named because the foot Greater Yang channel follows the lower back to converge at the perineum; the "Direct Yang Vessel" runs alongside the spine downward, passes through the buttocks to the popliteal fossa, then proceeds along the posterior lower leg and posterior to the lateral malleolus; the so-called "above the Qiao, below the Xi" refers to the area near Chengjin (BL56), which the ancients considered forbidden for direct needling—only blood-letting via superficial venules was permitted.
There is also lumbago from the "Changyang Vessel" (Prosperous Yang), with pain radiating to the chest, blurred vision, and in severe cases, opisthotonos (arched-back rigidity), curled tongue, and inability to speak. The ancients would needle at a point two cun above the inner malleolus, anterior to the great sinew and posterior to the Greater Yin channel—the area near Jiaoxin (KI8), the xi-cleft point of the Yin Qiao.
The Suwen · Treatise on Contralateral Needling (Miaoci Lun) states that when pathogenic qi invades the foot Yang Qiao vessel, eye pain begins from the inner canthus; acupuncture near Shenmai (BL62) can be applied using the contralateral needling method—needling the right side for left-side disease and the left side for right-side disease. The Lingshu further mentions that redness and pain of the eyes starting from the inner canthus can be treated at the Yin Qiao's Jiaoxin (KI8) point. For wind-spasms with opisthotonos, one should first let blood from the foot Greater Yang channel and the blood vessels near Weizhong (BL40) in the popliteal fossa; if cold pathogens are present, then also treat the Yin Qiao vessel and the blood vessels near the Dadun (LR1) point at the junction of skin and nail on the lateral side of the great toe. Li Shizhen supplemented the exact locations and ancient needling/moxibustion dosages for these points; however, these ancient point-manipulation techniques are provided solely as philological documentation and must not be self-administered.
Regarding the mechanism of sleep, the ancients held that the Yin Qiao and Yang Qiao vessels intersect at the outer canthi. When yang qi predominates, the eyes open; when yin qi predominates, the eyes close. The Jiayi Jing (A-B Classic of Acupuncture) states: when the eyes are closed and cannot see, defense qi (wei qi) 💨 remains stagnant in the yin aspect, unable to emerge into the yang aspect—the Yin Qiao being replete while yang qi is vacuous. When the eyes cannot close, it is because defense qi is lodged in the yang aspect, unable to enter the yin—the Yang Qiao being replete while yin qi is vacuous.
The Lingshu further explains: after the five grains enter the stomach, they are divided into three pathways—dregs, fluids, and ancestral qi (zong qi). Ancestral qi accumulates in the chest, emerges upward to the throat, and passes through the heart and lungs to govern respiration. Nutritive qi (ying qi) transforms into blood, nourishing the four limbs and internal organs. Defense qi is swift and slippery, circulating through the intermuscular spaces of the body surface—traveling through the yang aspect during the day and the yin aspect at night. If pathogenic qi lodges in the five viscera and six bowels, defense qi can only guard the exterior and travel through the yang aspect, unable to enter the yin; thus yang becomes replete and yin becomes vacuous, resulting in insomnia. The treatment principle is to supplement insufficiency and drain repletion, unblocking the pathway by which defense qi enters and exits, and dispelling pathogenic qi.
The ancients employed Banxia Tang (Pinellia Decoction) 🌿: take eight sheng of flowing water, repeatedly stir and aerate it, then take five sheng of the clear top portion. Boil over a flame made from reeds, then add one sheng of sorghum rice (shu mi) and five ge of processed pinellia (Banxia). Simmer slowly until reduced to one and a half sheng. Strain, and drink one small cup per dose. Administer three times daily, gradually increasing the dosage until a therapeutic effect is achieved. The text states that in recent-onset cases, the patient falls asleep immediately upon drinking and the disease resolves with sweating; in chronic cases containing three doses brings recovery, lasting cases can be resolved with three drinks. Li Shizhen also cites the Lingshu and other texts: the sinew of the foot Greater Yang forms the upper eyelid curtain, and the sinew of the foot Yangming forms the lower eyelid curtain. Cold causes sinew tension and inability to close the eyes; heat causes sinew relaxation and inability to open the eyes. In those in their prime, qi and blood are exuberant," "abundant with proper nutritive and defense qi circulation—alert by day and soundly asleep by night. In the elderly, qi and blood decline, the air passages become rough—lethargic during the day and unable to sleep well at night. Excessive sleeping is associated with a large stomach and intestines, rough skin texture, and sluggish defense qi circulation. Zhang Zihe, Chao Yuanfang, Wang Shuhe, and others also discussed excessive somnolence and insomnia from the perspectives of excessive rumination, spleen disorders, and gallbladder disorders—though not explicitly mentioning the two Qiao vessels, their discussions all remain within the framework of yin-yang, nutritive-defense, and vacuity-repletion dynamics.
The two Qiao vessels are passageways for the ebb and flow of yin and yang: The Yin Qiao governs the interior, stillness, and yin; the Yang Qiao governs the exterior, movement, and yang. Together they coordinate the relative tension and relaxation of the medial and lateral aspects of the body, the opening and closing of the eyelids, and the diurnal circulation of defense qi. The core pathological pattern of Qiao vessel disorders is "imbalance of relaxation and tension"—one side contracted, one side relaxed—reflecting the relative excess or decline of yin-yang qi dynamics.
Sleep is the result of defense qi emerging from yin into yang: When defense qi circulates through the yang aspect during the day, one remains awake; when defense qi enters the yin aspect at night, one sleeps soundly. If pathogenic qi obstructs the passage or the viscera are in disharmony so that defense qi cannot enter the yin, yang becomes replete and yin vacuous, resulting in insomnia. Conversely, when defense qi cannot emerge into the yang, yin becomes replete and yang vacuous, causing excessive somnolence and closed eyes. This constitutes an important model in Chinese medicine for understanding sleep rhythms.
Treatment follows the principle of "freeing the pathway, dispelling the pathogen, and harmonizing vacuity and repletion": Whether through acupuncture, moxibustion, point selection, or Banxia Decoction, the goal is uniformly to restore the flow of the yin-yang Qiao vessels and the circulation of defense qi. Disease in the exterior may be treated with diaphoresis; disease in the interior with purgation. Epilepsy with daytime attacks is treated via the Yang Qiao; nighttime attacks via the Yin Qiao—reflecting a treatment strategy that integrates temporal rhythms with pathological location.
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