Seven (7) healthy volunteers were injected hypodermically with a minimal amount of tracer into 6 acupoints on 6 yin meridians of the hand and foot. We found a total of 6 regional specific channels in one forearm and one lower leg of each subject, respectively, but no specific channels were visualized following injection of the tracer into the sites of nonacupoints. Magnetic resonance angiography confirmed the specific channels were not the superficial veins in the subcutis