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Chapter 11 of 81
黄帝内经·灵枢
The Yellow Emperor asked Qi Bo: I have heard that the structure of the human body corresponds to the laws of nature. Within the body there are the Five Zang Organs (Heart, Liver, Spleen, Lung, Kidney), corresponding to the Five Tones, Five Colors, Five Seasons, Five Flavors, and Five Positions in nature; externally there are the Six Fu Organs (Gallbladder, Stomach, Large Intestine, Small Intestine, Bladder, San Jiao), corresponding to the Six Pitch-Pipes (Liu Lü), which in turn establish the Yin and Yang channels, aligning with the Twelve Months, Twelve Earthly Branches, Twelve Solar Terms, Twelve Rivers, Twelve Double-Hours, and Twelve Main Channels. This is the principle of the correspondence between the Five Zang and Six Fu organs and Heaven and Earth.
These Twelve Main Channels are the foundation of human survival, the source from which disease arises, the key to treatment, the opportunity for recovery, the starting point of medical study, and the pinnacle of a physician's refined skill. Those with superficial medical skill find them easy; those with superior skill find them profoundly deep and difficult to master. May I ask what is the separation, union, exit, and entry (the pathway of branching and rejoining between channels and their collaterals) of the Twelve Main Channels?
Qi Bo bowed respectfully and replied: What a clear question! This is precisely what the superficial practitioner overlooks and what the superior practitioner devotes himself to studying. Allow me to explain in detail.
The Separate Channel of the Foot-Taiyang (Bladder) 🌊 branches from the popliteal fossa (back of the knee). One branch descends five cun below the buttocks, separates and enters the anus, attaches to the Bladder, disperses to the Kidney, ascends along both sides of the spine, and spreads internally at the region of the Heart; the straight branch ascends from the spine, emerges at the back of the neck, and reconnects with the Foot-Taiyang main channel. This is the first Separate Channel.
The Separate Channel of the Foot-Shaoyin (Kidney) 💨 reaches the popliteal fossa, sends out a branch that unites with the Foot-Taiyang Separate Channel, ascends to the Kidney, and at the fourteenth vertebra emerges to attach to the Dai Channel (Belt Channel); the straight branch ascends to connect with the root of the tongue, then emerges at the back of the neck, where it unites with the Foot-Taiyang Separate Channel. This is the First Union (the first convergence of the interior-exterior Yin and Yang Separate Channels). All separating branches of Yin channels are called "Zheng" (an alternate name for Separate Channels).
The Separate Channel of the Foot-Shaoyang (Gallbladder) 🔥 circles around the thigh, enters the margin of the pubic hair, and unites with the Foot-Jueyin Channel; a branching vessel enters the region between the flanks (lower chest), travels within the chest and attaches to the Gallbladder, disperses upward to the Liver, penetrates the Heart, ascends alongside the throat, emerges below the jaw and between the cheeks, spreads over the face, connects with the Eye System (the tissue connecting the back of the eyeball to the brain), and reunites with the Foot-Shaoyang main channel at the outer canthus of the eye.
The Separate Channel of the Foot-Jueyin (Liver) 🌿 branches from the dorsum of the foot, ascends to the margin of the pubic hair, unites with the Foot-Shaoyang Separate Channel, and then travels alongside it. This is the Second Union.
The Separate Channel of the Foot-Yangming (Stomach) 🩺 ascends to the thigh (upper anterior region), enters the abdominal cavity, attaches to the Stomach, disperses to the Spleen, ascends to connect with the Heart, travels upward along the throat and emerges from the mouth, ascends to the bridge of the nose and the eye socket, encircles and connects with the Eye System, and reunites with the Foot-Yangming main channel.
The Separate Channel of the Foot-Taiyin (Spleen) 💨 ascends to the thigh, unites with the Foot-Yangming Separate Channel, then travels alongside it, ascending to bind at the throat and penetrating through the middle of the tongue. This is the Third Union.
The Separate Channel of the Hand-Taiyang (Small Intestine) 🌊 descends (toward the earth), branches from the shoulder joint, enters the axilla, goes toward the Heart, and connects with the Small Intestine.
The Separate Channel of the Hand-Shaoyin (Heart) 🔥 branches from deep within the axilla between the two sinews, attaches to the Heart, ascends toward the throat, emerges at the face, and reunites with the Hand-Taiyang main channel at the inner canthus. This is the Fourth Union.
The Separate Channel of the Hand-Shaoyang (San Jiao) 🌿 ascends (toward heaven), branches from the vertex, descends into the Quepen (supraclavicular fossa), passes down through the San Jiao, and disperses within the chest.
The Separate Channel of the Hand-Jueyin (Pericardium) 💨 branches from three cun below Yuanye (GB-22), enters the chest, separately attaches to the San Jiao, emerges traveling along the throat, exits behind the ear, and reunites with the Hand-Shaoyang main channel below the Wangu (mastoid process). This is the Fifth Union.
The Separate Channel of the Hand-Yangming (Large Intestine) 🌊 ascends from the hand along the chest and breast, branches at Jianyu (LI-15), enters below the cervical vertebra (Zhu Gu), descends toward the Large Intestine, attaches to the Lung, ascends along the throat, emerges from Quepen, and reunites with the Hand-Yangming main channel.
The Separate Channel of the Hand-Taiyin (Lung) 💨 enters at Yuanye (GB-22) anterior to the Hand-Shaoyin channel, proceeds toward the Lung, disperses to the Large Intestine, ascends to emerge from Quepen, travels along the throat, and then unites with the Hand-Yangming Separate Channel. This is the Sixth Union.
The central academic thought of this chapter is "the union of Yin and Yang, interior and exterior" and "Separate Channels deeply pass to attach to Zang organs".
Yin-Yang pairing forming six unions: The Twelve Main Channels, following the principle of "one Yin paired with one Yang" as interior-exterior counterparts, form six pairs (Six Unions). Between each pair of interior-exterior channels, deep-level connection is achieved through Separate Channels — Yang channel Separate Channels penetrate deeply into the body, attach to the corresponding Fu organs, and then converge with the Separate Channels of their paired Yin channels. This embodies the holistic view of Chinese medicine that "within Yin there is Yang, within Yang there is Yin" and "Zang and Fu correspond as a whole."
Separate Channels are the "deep bridges" between interior-exterior channels: Unlike the main trunks of the Twelve Main Channels that travel along the body surface, the Separate Channels (deeply coursing branches that separate from the main channels) penetrate deep into the body cavities, directly connecting to the Zang-Fu organs, thereby strengthening the deep connections between the Twelve Main Channels and the organs, as well as between interior-exterior paired channels. The ancients called them "Zheng," meaning the Separate Channels of Yin channels follow the "proper path" of the Yang channel Separate Channels.
"Separation, union, exit, and entry" is the key to mastering the channels: Qi Bo emphasized that the inferior practitioner finds it "easy" yet "misses" it, while the superior practitioner finds it "difficult" yet "dwells" in it — illustrating that the courses of the Twelve Separate Channels manifest the regularity of channel qi in separation (branches leaving), union (branches joining), exit (emerging at the surface), and entry (penetrating deeply), which is the key to understanding the deep-level structure of the channel system.
Naive attempts at anatomical mapping: The descriptions of Separate Channels penetrating deep into the body cavities and connecting to the organs may be regarded as an early systematic observation by the ancients of relationships between internal organs and surface body structures. For example, "Foot-Taiyang Separate Channel attaches to Bladder, disperses to Kidney" and "Hand-Yangming Separate Channel attaches to Lung, goes toward Large Intestine" correspond, to a certain degree, to vague modern anatomical understandings of visceral fascia and surface neurovascular pathways.
Hypotheses regarding the mechanisms of interior-exterior connection: Modern research suggests that the "interior-exterior union" of the channels may partially correspond to segmental neural innervation and fascial continuity. For example, the communication between Foot-Taiyang (Bladder channel) and Foot-Shaoyin (Kidney channel) beside the spine and deep within the abdominal cavity shows spatial overlap with the lumbar sympathetic ganglionic region and the pelvic-abdominal visceral nerve plexuses in modern anatomy. However, this is only limited corroboration at certain levels; the specific pathways of the Separate Channels do not correspond one-to-one with modern anatomical structures.
Honest acknowledgment of historical limitations: Courses of the Separate Channels, such as "spreading to the face, connecting to the Eye System" and "binding at the throat, penetrating the tongue" are theoretical constructs of the ancients, lacking reproducible anatomical or physiological evidence. They should be understood as conceptual models for explaining the holistic connections within the human body, rather than anatomical facts.
Harmonize interior and exterior, cultivate wholeness: The theory of Separate Channels suggests that the connections between the interior and exterior of the body are far deeper than what appears on the surface. Daily health maintenance should not focus solely on local surface areas, but should balance nourishing the internal organs with regulating the external channels — such as moderate exercise (promoting the circulation of qi and blood) and regular routines (following the waxing and waning of Yin and Yang).
Appropriate depth and rhythm — movement within stillness: The rhythmic "separation, union, exit, and entry" of the Twelve Separate Channels indicates that the body's qi alternates between deep and shallow circulation. In daily life, one may pay attention to balancing exertion and rest — moderate exercise to stretch the channels, quiet sitting with breath regulation to nourish the organs — allowing the orderly exit and entry of qi movement.
Follow the four seasons and regulate rhythms: The text emphasizes the correspondence of the Twelve Main Channels with the twelve months, twelve earthly branches, and twelve double-hours, suggesting that daily life should follow the natural periodic rhythms — such as regular sleep-wake patterns and seasonal dietary and activity adjustments — which help maintain the harmony of qi circulation through the channels.
Related Concepts:
Further Reading:
This content is based on classical Chinese medicine texts and is provided solely for traditional cultural study and research. It does not constitute any medical diagnosis, medication, or treatment advice. If you feel unwell, please seek medical attention promptly.