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Fig. 2 | BMC Complementary and Alternative Medicine

Fig. 2

From: Coarse needle surface potentiates analgesic effect elicited by acupuncture with twirling manipulation in rats with nociceptive pain

Fig. 2

Roughness of acupuncture needles. The surface roughness was observed using a microscope (SZ61, Olympus Co., Japan). The tips of the needles were presented in the photos. a and b indicate acupuncture needles with high (200 grit number) and low (600 grit number) coarseness, respectively. The lengths of the needle handle and body were 20 mm and 40 mm, respectively

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