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[Investigation on sea of marrow and the application of Naohu (GV 17)].

The theory on four seas is a kind of view to explain the longitudinal and horizontal distribution relationship of meridians and collaterals by ancient scholars. The authors were attempted to explore it by taking the theory on sea of marrow as example in terms of literature analysis. In Lingshu: Hailun (Chapter 33 of Miraculous Pivot), it is recorded that sea of marrow flows into two locations, but they are not the acupoint sites for treatment. Based on the comprehensive literature investigation, it is known that such two sites to which sea of marrow flows refer to a kind of boundaries so that the range of sea of marrow is determined, the function of it explored, and the controversy on "heart dominating mind" and "brain governing spirit" solved. It is defined that the function of sea of marrow is the macro-conception of shen (mind, spirit) that is modulated by vital movement information. Additionally, in association with meridian literature analysis, as well as acupoint textual research, it finally focuses on Naohu (GV 17) that is the critical point in the application of the theory on sea of marrow. In clinical application of such theory, the importance should be attached to the governor vessel, Naohu (GV 17) and their spatial system of bone.