BL-62 (Shen Mai) Extending Vessel

What does BL-62 Shen Mai do?

BL-62 Shen Mai is the Confluent point of the Yang Motility Vessel (Yang Qiao Mai) — the point from which that extraordinary vessel is said to begin and through which it is reached — paired in use with SI-03 Hou Xi, and it is also recorded as one of Sun Si-miao's Ghost points. Both classifications point the same way. The Yang Motility Vessel governs the outer side of the body, the tone of the limbs and, most distinctively, the opening of the eyes and the alternation of waking and sleep; the Ghost points are the group Sun Si-miao assembled for disorders of the mind. BL-62's recorded actions run along that seam between movement, the eyes and the spirit.

• Opens and regulates the Yang Motility Vessel — the defining action. The vessel begins at this point, runs up the outside of the leg and trunk to the shoulder and face, and ends at the inner corner of the eye, where it meets its yin counterpart.
• Pacifies interior wind and expels exterior wind — an unusual double action, applied both to wind arriving from outside with stiffness of the neck and headache, and to the internally generated wind of the classical stroke and seizure patterns.
• Calms the spirit — the Ghost-point action, recorded for mania, agitation, and epilepsy, and for the restless sleeplessness described below.
• Benefits the head and the eyes — the vessel terminates at the inner canthus, which is the recorded basis for its use in headache, dizziness and eye disorders, and for the classical link between this point and whether the eyes stay open.
• Regulates waking and sleeping — the action for which BL-62 is best known in modern practice: reducing at Shen Mai and reinforcing at KI-06 Zhao Hai for insomnia, and the reverse pattern for excessive daytime sleepiness.
• Activates the channel and alleviates pain — its local and channel role for lumbar and leg pain, ankle complaints, and one-sided tightness of the limbs.

Source: Sacred Lotus sources & references (channel, Yang Motility Vessel Confluent and Ghost-point classification, existing action record); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 320; Chinese Acupuncture & Moxibustion, p. 190; cross-referenced against multiple online sources.

What is BL-62 Shen Mai used for?

BL-62 is used for three things above all: disturbed sleep, wind and spirit disorders, and tightness or pain down the outer side of the body. The indications recorded in Sacred Lotus sources & references are set out below. They describe traditional use, not proven treatment.

• Insomnia, and difficulty falling asleep with the eyes that will not close
• Excessive sleepiness during the day (the reverse presentation, treated by reversing the technique)
• Epilepsy and seizure disorders
• Mania, agitation and disordered behaviour
• Headache
• Dizziness
• Redness, pain or twitching of the eyes
• Stiffness and pain of the neck and the whole back
• Backache, and lumbar pain radiating down the leg
• Aching, weakness or tightness of the leg
• Pain and swelling of the outer ankle; difficulty turning the foot outward
• Windstroke patterns with one-sided rigidity or looseness of the limbs

Source: Sacred Lotus sources & references (existing indication record); Chinese Acupuncture & Moxibustion, p. 190; Deadman & Al-Khafaji, A Manual of Acupuncture, p. 320; cross-referenced against multiple online sources.

How is BL-62 Shen Mai used in practice?

Shen Mai sits on the outer side of the foot, in the hollow immediately below the bony knob of the outer ankle. It is one of the easiest points on the body to find: run a finger down the outside of the ankle bone until it drops into the depression beneath. KI-06 Zhao Hai, its constant partner, sits in the corresponding hollow below the inner ankle bone on the other side of the same foot — the two face each other across the ankle, which makes the yin-and-yang symmetry of the Motility vessels physically obvious.

Note on the location records. The two sourced location references held in Sacred Lotus sources & references describe this hollow slightly differently. One places the point in the depression directly below the outer ankle bone; the other places it about half a cun below the lower border of that bone, in a depression behind the fibular (peroneal) tendons. Both are retained unchanged and neither has been rewritten. The difference is small and concerns whether the hollow is taken directly beneath the malleolus or slightly behind the tendons that pass under it; practitioners should be aware that reference texts are not perfectly uniform here.

• With SI-03 Hou Xi — the Confluent pair. SI-03 opens the Governing Vessel from the hand, BL-62 opens the Yang Motility Vessel from the foot, and the two are needled together as a matched upper-and-lower unit. Their shared territory is the inner corner of the eye, the back of the neck, the ear, the shoulder and the whole length of the spine — which is why this is the pair reached for in stiff neck, spinal pain and the yang-excess presentations. The pairing is not merely a textbook convention: an analysis of 240 classical passages from 26 Chinese medical books found Shen Mai to be the single most frequent partner point of Hou Xi in the entire ancient literature, ahead of LI-04, SI-02, GB-20 and the rest (PMID 35616422).
• With KI-06 Zhao Hai — the Motility-vessel pair, and the combination most associated with sleep. The classical account holds that when defensive qi fails to pass from yang into yin at night the Yang Motility Vessel is full and the Yin Motility Vessel empty, and the eyes will not close; the corresponding treatment reduces at BL-62 and reinforces at KI-06, reversing the technique for the opposite complaint of daytime somnolence.
• With BL-60 Kun Lun — its immediate neighbour behind the outer ankle, for local ankle and heel complaints and for lumbar pain.
• With DU-20 Bai Hui and DU-26 Shui Gou — for the spirit and seizure indications, where BL-62 is used as a Ghost point.
• With GB-20 Feng Chi and SI-03 — for stiffness and pain of the neck and occiput.
• With GB-40 Qiu Xu and BL-60 — the local ring of points around the outer ankle, used together for sprain and restricted movement.

What are the eight Confluent points, and which does this site hold?

Sacred Lotus sources & references hold all eight Confluent points of the extraordinary vessels, in their four traditional pairs. The eight Confluent points (ba mai jiao hui xue) are the points on the ordinary channels at which the eight extraordinary vessels can be reached and opened. Each is paired with one other — always one point on the arm and one on the leg — and each pair commands a defined region of the body:

• SI-03 Hou Xi (Governing Vessel) with BL-62 Shen Mai (Yang Motility Vessel) — the inner corner of the eye, the neck and occiput, the ear, the shoulder, the spine and the back.
• SJ-05 Wai Guan (Yang Linking Vessel) with GB-41 Zu Lin Qi (Girdling Vessel) — the outer corner of the eye, the cheek, behind the ear, the neck and the shoulder.
• P-06 Nei Guan (Yin Linking Vessel) with SP-04 Gong Sun (Penetrating Vessel) — the heart, the chest and the stomach.
• LU-07 Lie Que (Conception Vessel) with KI-06 Zhao Hai (Yin Motility Vessel) — the throat, the chest, the lung and the diaphragm.

Four of the eight — LU-07, P-06, SJ-05 and SP-04 — are Connecting (Luo) points as well, and so appear on two of the classification lists at once; BL-62, SI-03, GB-41 and KI-06 are not. The system was set out in Dou Hanqing's Zhen Jing Zhi Nan in the Yuan dynasty and later elaborated into the Ling Gui Ba Fa, the Mystical Turtle Eight Methods, in which the eight points are opened according to the day and hour of treatment. That method is still used: a case report of oculomotor nerve palsy in Zhongguo Zhen Jiu describes a treatment built on the Ling Gui Ba Fa opening of all eight — Wai Guan, Zu Lin Qi, Gong Sun, Nei Guan, Zhao Hai, Lie Que, Shen Mai and Hou Xi — with local and distal points added (PMID 41558712). A single case report proves nothing about outcome, but it does show the framework in current clinical use.

Source: Sacred Lotus sources & references (location records, Confluent-point classification, full eight-point Confluent set); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 320; Chinese Acupuncture & Moxibustion, p. 190; Zhen Jing Zhi Nan (Dou Hanqing, Yuan dynasty); PubMed PMID 35616422, 41558712; cross-referenced against multiple online sources.

Where is BL-62 located?

• A Manual of Acupuncture (p. 320): On the lateral side of the foot, approximately 0.5 cun inferior to the inferior border of the lateral malleolus, in a depression posterior to the peroneal tendons.
• Chinese Acupuncture and Moxibustion (p. 190): In the depression directly below the external malleolus.

How is BL-62 Shen Mai needled in the textbooks?

Reference record only — this sets out what the standard texts document, not instruction for a reader. Sacred Lotus sources & references record perpendicular insertion of 0.3 to 0.5 inch at BL-62, with moxibustion noted as applicable. Deadman & Al-Khafaji record a comparable shallow perpendicular range. Both records are short figures, and the reason is straightforward: there is very little soft tissue at this point before bone.

• Angle documented: perpendicular into the hollow below the outer ankle bone.
• Depth documented: approximately 0.3–0.5 cun. This is one of the shallower recorded depths on the body, and it is set by local anatomy rather than by any hazard to a body cavity.
• Moxibustion: documented as applicable.

Safety reference — the measured anatomy. BL-62 carries no cavity or organ hazard whatever: it is on the side of the foot, as far from the chest, abdomen and skull as a point can be. What bounds it is entirely local and can be stated precisely. Immediately deep to the skin and the thin subcutaneous layer lies the lateral wall of the calcaneus, the heel bone — bone is the floor at this point, typically within a few millimetres of the surface, which is why the recorded depth is so short. Passing forward and downward across the region, just above or in front of the hollow depending on which location record is followed, are the tendons of fibularis (peroneus) longus and brevis in their common synovial sheath, held down by the fibular retinaculum. Running behind the outer ankle bone toward the little toe are the sural nerve and the small saphenous vein; the calcaneofibular ligament lies deep in the same region.

The events recorded at points of this kind are correspondingly local: striking periosteum, which is documented as sharply painful; entering a tendon or its sheath; a transient radiating sensation along the outer border of the foot where a cutaneous nerve is contacted; and superficial bruising. None of these is in the class of the pneumothorax risk that attends points over the thorax and upper back. No pregnancy caution is recorded at BL-62 in the standard references — that caution attaches to certain other points and should not be transferred here by assumption. Standard clean-needle practice applies. Acupuncture is carried out only by a qualified, licensed practitioner; this record documents the literature and is not a technique guide.

Source: Sacred Lotus sources & references (existing needling record); Chinese Acupuncture & Moxibustion, p. 190; Deadman & Al-Khafaji, A Manual of Acupuncture, p. 320 (surface and deep anatomy of the lateral ankle).

What does the name Shen Mai mean?

Shen Mai translates as "Extending Vessel" — mai meaning a vessel, channel or pulse, and shen carrying two senses that the tradition uses simultaneously. In its ordinary sense shen means to stretch, extend or straighten out, which describes the Yang Motility Vessel that begins here and extends the whole length of the outer body from the ankle to the eye — and also describes the vessel's role in the stretching and straightening of the limbs. In its calendrical sense shen is the ninth of the twelve earthly branches, the double-hour of the late afternoon, which in the Chinese organ clock is the period allotted to the Bladder — the channel this point sits on. Both readings are recorded and both are apt. The point also carries the alternative classical name Yang Qiao, simply the name of the vessel itself, and, as one of Sun Si-miao's Ghost points, the name Gui Lu, "Ghost Path". Other translations render it "Extending Meridian", "Ninth Channel" or "Stretch Vessel".

What is the Yang Motility Vessel?

The Yang Qiao Mai — Yang Motility, Yang Heel or Yang Stepping Vessel — is one of the eight extraordinary vessels. Qiao refers to the heel and to nimbleness of movement, and the vessel's described course begins at BL-62 below the outer ankle, ascends the outer side of the leg and thigh, passes the hip, the side of the trunk and the shoulder, crosses the neck and cheek, and terminates at the inner corner of the eye, where it meets the Yin Motility Vessel rising on the inner side of the body. Three functions follow from that course, and all three are clinical.

• The outer side of the body and the tone of the limbs. The two Motility vessels are described as balancing the muscular tone of the outer and inner aspects of the limbs. Where one side is tight and the other slack — the classical description of certain post-stroke presentations — the tradition reads it as an imbalance between them.
• The eyes and the sleep-wake cycle. Both vessels end at the inner canthus, and the Ling Shu ties them directly to whether the eyes open or close: defensive qi travelling in the yang by day keeps the eyes open, and its passage into the yin at night lets them close. When that passage fails, the yang vessel is full and the yin vessel empty and sleep does not come. This is the classical mechanism behind the BL-62 and KI-06 sleep combination, and it is one of the tidiest pieces of reasoning in the whole point system.
• Wind, seizure and spirit disorders — the vessel reaches the head, and its Confluent point is also a Ghost point.

What is a Sun Si-miao Ghost point?

The thirteen Ghost points are a group assembled by the Tang-dynasty physician Sun Si-miao in the Qian Jin Yao Fang for the treatment of what the period called ghost possession — the presentations a modern reader would recognise as severe mental and behavioural disturbance, mania, and seizure. Each carries a gui (ghost) name alongside its ordinary one, and BL-62's is Gui Lu, Ghost Path. The grouping is historical and is recorded as such; it is not a claim about causation, and the points remain in use today for agitation, mania and epilepsy on the strength of their ordinary channel indications rather than the demonological framing.

How does BL-62 differ from nearby points?

BL-60 Kun Lun lies behind rather than below the outer ankle bone, in the hollow between it and the Achilles tendon, and is the Fire and River point of the Bladder channel; it shares BL-62's use for headache, neck stiffness and lumbar pain but is a channel point rather than a Confluent point, and it does carry a recorded caution in pregnancy that BL-62 does not. KI-06 Zhao Hai is BL-62's exact counterpart below the inner ankle, opening the Yin Motility Vessel. BL-61 Pu Can and BL-63 Jin Men sit either side of BL-62 along the outer border of the foot and are local points without its extraordinary-vessel role. GB-40 Qiu Xu lies in front of and below the outer ankle bone rather than directly beneath it, and is the Gall Bladder channel's Source point.

Is there research on BL-62?

BL-62 is better served by research than most extraordinary-vessel points, because the one combination it is famous for — Shen Mai with Zhao Hai for sleep — has actually been tested, and because a documentary study confirms its classical pairing rather than merely asserting it. The evidence is still limited, and none of it establishes clinical effectiveness.

• A randomised controlled trial in 84 patients with delayed sleep-wake phase disorder compared real acupuncture with placebo needling at the same points, the prescription led by BL-62 Shen Mai and KI-06 Zhao Hai with LI-04, LIV-03, ST-36 and SP-06 added. Over eight weeks the real-acupuncture group showed longer total sleep time, better sleep efficiency, fewer awakenings and less time awake after sleep onset on actigraphy, together with improved morningness-eveningness, insomnia-severity and fatigue scores that persisted at one and three months (PMID 36858383). It is a single-centre trial with a multi-point prescription, so it does not isolate BL-62 — but the Motility-vessel pair is the prescription's organising idea, which is more than can be said for most acupuncture trials that happen to include a point.
• A data-mining analysis of 37 published studies and 60 acupuncture prescriptions for insomnia in older adults identified Zhao Hai (KI-06) with Shen Mai (BL-62) as one of the most frequently used point combinations in that literature (PMID 34936283). This documents prescribing practice, not effect.
• A laboratory study in a rat model of insomnia applied needling specifically to the "Qiao mai" points — Zhao Hai and Shen Mai — and reported improved sleep measures alongside changes in macrophage populations and inflammatory markers, framed against the classical theory of defensive qi (PMID 41735068). Animal work, and mechanistic rather than clinical.
• The latent-structure analysis of 240 classical passages establishing Shen Mai as the commonest historical partner of Hou Xi is described above (PMID 35616422); the Ling Gui Ba Fa case report is at PMID 41558712.

What this does not support is any claim that BL-62 treats insomnia, epilepsy, back pain or eye disease. The fair summary is that the classical Motility-vessel sleep pairing has been carried into modern trial design, that one reasonably sized randomised trial built around it reported positive sleep outcomes, and that the point's standing otherwise rests on the classical and clinical record.

Source: Sacred Lotus sources & references; Deadman & Al-Khafaji, A Manual of Acupuncture, p. 320; Chinese Acupuncture & Moxibustion, p. 190; Ling Shu (Spiritual Pivot) on the Motility vessels and the closing of the eyes; Qian Jin Yao Fang (Sun Si-miao) for the Ghost points; Zhen Jing Zhi Nan (Dou Hanqing) for the Confluent-point system; PubMed PMID 36858383, 34936283, 41735068, 35616422, 41558712 (each verified resolvable and checked for retraction status before citation); cross-referenced against multiple online sources.