Figure 1
From: Sensory nerve action potentials and sensory perception in women with arthritis of the hand
Experimental set-up for recording sensory nerve action potentials (SNAPs). ( a) For the median and ulnar nerves, ring electrodes are placed over the 4th digit and the nerve is stimulated 13 cm proximal to the closest recording electrode. This image shows the stimulating site for the median nerve. ( b) For the radial nerve, the bipolar recording electrode is placed distal to the ‘snuff box’, and the stimulating probe is placed 10 cm proximal to the closest recording electrode. The reference electrode is placed on the back of the hand for all tests.