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On the posterior midline, 0.5 cun within the posterior hairline, in the depression below the spinous process of the 1st cervical vertebra.
Needle perpendicularly 0.5-0.8 cun. Deep insertion or needling obliquely upward is not advisable as it is near the medullary bulb in the deep layer, and the depth and angle of the puncture should be strictly observed.
