“Zan” means to gather together, referring to the movement of the eyebrow in the act of frowning. “Zhu” means bamboo leaves and refers to the shape of the eyebrow; when one frowns, the eyebrow looks like a piece of bamboo leaf. The point is at the medial end of the eyebrow, hence the name Zanzhu (Gathering Eyebrow).
Superior to Jingming (BL1) on the medial end of the eyebrow, where there is a depression which can be detected by finger pressure.
Blurring of vision.
Pain of the supraorbital region (combine with Fengchi (GB20).
Spasm of the facial muscles.
Twitching of the eyelids.
Frontal sinusitis (combine with Yintang (Extra) and Shangxing (GV23)).
Promote the collaterals.
Brighten the eye.