K-8 is located how many cun inferior to K-3?

K-8, also known as "Jiao Xin," is an acupuncture point that is located on the medial side of the leg, specifically just below the level of K-3 (kidney point 3), which is located in the depression between the medial malleolus and the Achilles tendon. The anatomical location of these points is crucial in understanding their clinical application and how practitioners can accurately locate them on the body.

The distance between K-3 and K-8 is measured in cun, a traditional Chinese measurement that corresponds to the width of a person's thumb at the joint. K-8 is positioned approximately 1 cun inferior to K-3. This means that, when palpating K-3, a practitioner would move downwards (towards the foot) about the width of their thumb to locate K-8.

Recognizing the specific measurements of acupuncture points is essential for effective treatment since precise needling can maximize therapeutic outcomes. Knowing K-8's position relative to K-3 reinforces the importance of accurate anatomical knowledge in acupuncture practice.