Which point lies on the posterior border of the sternocleidomastoid muscle, about 1 cun inferior to Wanggu GB-12, on a line between Tianzhu BL-10 and Tianrong SI-17?

• A. SJ 14
• B. SJ 16
• C. SJ 15
• D. SJ 20

Answer: (B)

The point is San Jiao sixteen. This spot sits on the posterior edge of the sternocleidomastoid muscle, along the line from Tianzhu (BL-10) to Tianrong (SI-17), about one cun below Wanggu (GB-12). That exact description—posterior border of the SCM, about 1 cun inferior to GB-12, on the BL-10 to SI-17 line—matches SJ16, which is why it’s the best answer. Other options are located in different regions (some higher or lateral, or in front of the ear), so they don’t fit this specific anatomical-and-line description.