在头部，横平枕外隆凸上缘，后正中线旁开1.3寸。

注：斜方肌外侧缘直上与枕外隆凸上缘水平线的交点,横平脑户(GVI7)。

On the head, at the same level as the superior border of the external occipital protuberance, and 1.3 B-cun lateral to the posterior median line.

Note: BL9 is located at the intersection of two imaginary lines: the vertical line of the lateral border of the trapezius muscle and the horizontal line of the superior border of the external occipital protuberance. At the same level as GV17.

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