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Location Guides:![]() |
Binding point of the foot Taiyang and foot Shaoyang Sinews
Meeting of Bladder with Gall Bladder
Over the second posterior sacral foramen.
Perpendicular insertion 0.5 - 1 cun, or 1.5 - 2 cun through the foramen using a slightly oblique medial and inferior insertion.
Contraindicated during pregnancy.
"The Taiyang usually has much Blood and little Qi" (Su Wen 素問 ch. 24) implying this channel should normally be bled.
"The foot Taiyang is to be pierced 5 fen deep and remain inserted for seven exhalations" (Ling Shu 靈樞 ch. 12).
"It is needled to a depth of three cun, (the needle) is retained for a duration of seven exhalations, and is moxaed with three cones" (Huangfu Mi 皇甫謐, 3rd Century, Zhenjiu Jiayi Jing 針灸甲乙經).
Regulates the Lower Jiao and facilitates urination and defecation
Regulates menstruation and stops leucorrhoea
Benefits the lumbar region and legs
Superficial Innervation: Dorsal rami of S1 - S3
Dermatome Segment: S3
Deeper Structures: Sacral nerve S1 emerging from foramen
See Montaigue, Dim Mak Locations, Taijiworld.com for explanation of effects.
As one of the Baliao or "eight crevices" located in the sacral foramen which all regulate urination, defecation, menstruation and lumbar region, and being at the same level as the bladder-shu Pangguangshu Bl-28 this point is the strongest of the Baliao for regulating urination.
Basic information on location, needle depth, TCM actions, indications and combinations is taken from Deadman et al (2001): A Manual of Acupuncture with additional anatomical information researched by reference to Gray's Anatomy (38th Ed., 1995) unless otherwise referenced. Images were found on acupunctureschoolonline.com and can be traced back to Claudia Focks (2008) Atlas of Acupuncture originally. I cannot claim any credit or rights over them. Other sources should be quoted in the text.
For some of the more unusual terms I have created a glossary here