Which GV point is at the vertex on the midline, in the depression 5 cun posterior to the anterior hairline and 7 cun superior to the posterior hairline?

• A. GV 22
• B. GV 21
• C. GV 20
• D. GV 23

Answer: (C)

Locating GV-20 relies on the standard head landmarks and cun measurements to find the vertex along the midline. The vertex point on the top of the head, Baihui, is located where a line drawn 5 cun behind the anterior hairline intersects a line 7 cun above the posterior hairline, and it sits on the midline. This precisely matches the description given, so the correct point is Baihui (GV-20). The other points are in different positions on the scalp and do not occupy that exact vertex location with those measurements.