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 循行：(1)起于小腹內，下出于會陰部，（2)向后行于脊柱的內部，（3)上達項后風府，進入腦內，（4)上行巔頂，（5)沿前額下行至鼻柱。
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The Course of the Vessel: It arises from the lower abdomen and comes out from the perineum. It runs posteriorly along the interior side of the spinal column to Fengfu(GV16) at the nape where it enters the brain. It further ascends to the vertex and goes down along the forehead to the nasal column.
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