Hai Quan (M-HN-37) is located at which structure between Jīnjīn and Yùyè?

• A. Center of the frenulum of the tongue between Jīnjīn and Yùyè
• B. Behind the ear, midway between Fengchi GB-20 and Yìfēng SJ-17
• C. Back of the neck, 2 cun above DU-14 and 1 cun lateral to the midline
• D. On the lower abdomen, 3 cun lateral to the midline, level with Ren-3

Answer: (A)

Hai Quan sits on the tongue, at the center of the frenulum between two nearby tongue points. Specifically, it is the midpoint of the frenulum between Jīn jīn and Yù yè. These three points are all on the underside of the tongue and are used together to address throat and mouth conditions, so the central Hai Quan is defined by its position right between Jīn jīn and Yù yè. To locate it, lift the tongue and find the frenulum; then identify the two lateral points near the tip, and the center between them is Hai Quan. The other options point to areas behind the ear, at the back of the neck, or on the lower abdomen, which are not related to this tongue-based point.