What is the distance from the posterior hairline to Du14 in cun?

To determine the distance from the posterior hairline to Du 14 in cun (a traditional unit of measurement in acupuncture), it is important to understand the anatomical landmarks and how they relate to cun measurements.

The distance measured between the posterior hairline and Du 14, which is located at the base of the neck between the spinous processes of the C7 vertebra and the T1 vertebra, is generally accepted to be 3 cun. This cun measurement is based on the standardized method of measuring using anatomical landmarks.

In this case, the answer is correct because the position of Du 14 corresponds to a distance of 3 cun from the posterior hairline, consistent with traditional Chinese medicine's anatomical references. Understanding this measurement is essential for practitioners in accurately locating acu-points for treatment purposes. It demonstrates the use of anatomical consistency across practitioners to ensure effective care and treatment outcomes.