Spleen Channel
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Which point is shown in the image below?
SP-4 is located in the depression distal and inferior to the base of the first metatarsal. It's about 1 cun away from SP-3; don't go all the way to the cuneiform bone.
Source: "The Spleen Channel of Hand Taiyin." A Manual of Acupuncture, by Peter Deadman et al., Journal of Chinese Medicine Publications, 2007, p. 186 [Q258]