BL-66 Zutonggu (足通谷) — Foot Valley Passage

On the lateral aspect of the foot, in the depression anterior and inferior to the head of the fifth metatarsal (distal to the metatarsophalangeal joint).

Seated with the foot supported, locate the point on the lateral aspect of the foot, in the depression distal to the fifth metatarsophalangeal joint, at the transition between light and dark skin.

Tendon of the abductor digiti minimi muscle. Innervated by the lateral dorsal cutaneous nerve.

Perpendicular insertion, 0.2–0.3 cun.

Zu (足), foot; Tong (通), passage; Gu (谷), valley. The point lies in the depression of the foot, comparable to a valley, through which the Qi of the meridian flows.