HENSEL, H. 
Figure 15. Experimental arrangement for recording afferent 
Impulses in cutaneous nerves in human subjects (before sterile 
covering). 
1. Arm of the subject. 
2. Metal holder for the arm. 
3. Hand support for nerve preparation. 
4. Adjusting screw for hand support. 
5. Metal plate. 
6. Skin marked for incision. 
7. Lamp attached to microscope. 
8. Stereo-microscope. 
9. Support for stereo-microscope. 
10. Magnification selector. 
11. Black plate for nerve dissection. 
12. Holder for electrode. 
13. Electrode. 
14. Micro-manipulator. 
15. Shielding cage. 
16. Lieads from electrode to pre-amplifier. 
17. Oscilloscope for observation. 
18. Thermode. 
19. Water inflow. 
20. Water outflow. 
21. Leads from thermocouple to galvanometer. 
22. Small thermode for testing the receptive field. 
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