THERMORECEPTOR PHYSIOLOGY 
Temp. 
40r' 
30 
20 
1 sec 
III I I II III I I I I IIIM II' I I I I I'l l . M 1 I I I 
llli m i M III M i mM lill !) ! ! I I 
40r' 
30-. 
20- 
I I l l l l l lllllllllllll l llllllllllll l| llllll l llll !!,! II M Ii y 
40p^ 
30- 
20-" 
I I I M II 
ll|llllllll|i m illllll||l!lil!l'i II II I f I 
40r ! I I 
30- 
20- 
iii i f i ii i iiiiiiiii iii ii M ii i ii hM ii M i iiim i 
Figure 5. Afferent impulses of a single C fiber in the cat and 
skin temperature when cooling the skin (fiber No.^1). Conduction 
velocity 1.1 m/sec. A, Cooling from 29 C to 25.5 C; B, 29.3 C 
to 28° C; C, 28° C to 26.5° C; D, 24.5° C to 22.5 C. (Hensel, Iggo, 
and Witt. 1960). 
43 
