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BL-30 White Ring Transport
白环俞 〔白環俞〕 bái huán shù
Alternate names: 玉房俞 yù fáng shù, Jade House Transport; 玉环俞 yù huán shù, Jade Ring Transport
Channel: BL, foot greater yáng (tài yáng) bladder channel
Modern location: An acupoint located on the sacrum, level with the fourth sacral foramen, 1.5 cùn lateral to the midline.
Classical location: One cùn and five fēn either side of the spine, below the twenty-first vertebra. The point is found in prostrate posture. From
Local anatomy: The inferior gluteal artery and vein; deeper, the internal pudendal artery and vein. Lateral branches of the posterior rami of the 3rd and 4th sacral nerves, the inferior gluteal nerve.
Action: Warms yáng and regulates the menses; courses the channels and rectifies the lower burner.
Modern indications: Enuresis; mounting qì (shàn qì, inguinal hernia); seminal emission; menstrual irregularities; vaginal discharge; pain in the sacrum.
Classical indications: Inhibited urination and defecation; vacuity heat block.
Needle stimulus: Needling: 0.7‒1.0 cùn perpendicular insertion. Moxa: pole 5‒10 min.
Point name meaning:
White ring
in Daoist metaphysics refers to the area of the body where essence is stored. The point name implies that
The heart above, the kidney below, the spleen to the left, liver to the right, life’s door [i.e., genitals] to the front, the secret door [i.e., anus] to the rear, it connects like a ring, white like silk one cùn in diameter. It wraps the body’s essence and is called the jade ring; this area is directly behind the navel and is the root of man’s lifeline.
The alternate names reinforce this explanation in their use of the word jade.
The bladder channel circles back up to Upper Bone-Hole (