What point is 3 cun above umbilicus, 4 cun lateral to REN meridian(Midline)?

Question

BlackTom AI · Accepted Answer

SP-16 (Fuai) is anatomically defined as 3 cun above the center of the umbilicus and 4 cun lateral to the Ren (Conception) meridian — this directly matches the coordinates given.

1) Relevant knowledge points and concepts
- Cun is a proportional body measurement used in acupuncture to locate points relative to anatomical landmarks (the umbilicus and the midline/Ren vessel here).
- Standard locations:
  - SP-16 (Fuai): 3 cun above the umbilicus, 4 cun lateral to Ren.
  - SP-15 (Daheng): level with the umbilicus, 4 cun lateral to Ren.
  - ST-22 (Guanmen): 3 cun above the umbilicus, 2 cun lateral to Ren.
  - ST-21 (Liangmen): 4 cun above the umbilicus, 2 cun lateral to Ren.

2) Step-by-step reasoning process
- The question requires a point that is both 3 cun superior (above) the umbilicus and 4 cun lateral to the midline.
- Compare each choice to the canonical locations above.

3) Intermediate steps / comparisons
- Option a: ST-21 Liangmen = 4 cun above umbilicus, 2 cun lateral → vertical off by 1 cun and lateral only 2 cun (mismatch).
- Option b: SP-16 Fuai = 3 cun above umbilicus, 4 cun lateral → vertical 3 cun and lateral 4 cun exactly match.
- Option c: ST-22 Guanmen = 3 cun above umbilicus, 2 cun lateral → vertical matches but lateral is 2 cun (mismatch of lateral distance and channel ST, not SP).
- Option d: SP-15 Daheng = level with umbilicus, 4 cun lateral → lateral matches but vertical is 0 cun (level), not 3 cun above.

4) Why the correct answer is correct
- SP-16’s official location is exactly 3 cun above the umbilicus and 4 cun lateral to the Ren meridian; both coordinates coincide with the question’s specification. It also belongs to the Spleen channel (SP), which is consistent with lateral 4-cun Spleen points.

5) Why other options are incorrect
- ST-21 and ST-22 are on the Stomach channel and located 2 cun lateral to midline (not 4 cun); their vertical levels differ (ST-22 is 3 cun above but only 2 cun lateral; ST-21 is 4 cun above).
- SP-15 is 4 cun lateral but at the level of the umbilicus, not 3 cun above.

6) Conclusion
Therefore the correct choice is SP-16 Fuai, matching the provided answer.

What point is 3 cun above umbilicus, 4 cun lateral to REN meridian(Midline)?Single choice

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