Fig. 4From: Coarse needle surface potentiates analgesic effect elicited by acupuncture with twirling manipulation in rats with nociceptive painThe different depths of abrasions on the differently scraped needle surfaces were observed. The maximum depth were about 0.625 μm in lightly scraped and 1.625 μm in deeply scraped, respectively. The normal (solid line, a), lightly scraped (dash-dotted line, b) and deeply scraped (dashed line, c) needle surfacesBack to article page