What is the distance of the AnMian point from GB 20?

The Anmian point, traditionally used for insomnia and other related conditions, is located near the GB 20 point (Fengchi), which is situated at the base of the skull. When assessing the distance between these two points, it is important to refer to the anatomical positioning based on the palpation methods taught in acupuncture practices.

Anmian is typically located about 1 cun posterior to the GB 20 point, specifically in a region that lies in a natural depression behind the mastoid process. The term “cun” refers to the standard unit of measurement used in acupuncture, which is often based on the width of the patient's own thumb.

Understanding this anatomical relationship, the correct answer reflects the proximity of the Anmian point to GB 20, which is recognized as being 1 cun apart. This specific measurement is crucial for practitioners during point location to ensure accurate treatment.