[Relation between the temperature of different skin layers and changes in the firing of cold cutaneous thermoreceptors].
On sharp changes (from 20 to 42 degrees C and vice versa) of temperature of the thermode placed on the upper lip of anesthetized rabbit, the temperature under the epidermis at the depth of 0.1--0.2 mm changed at the rate of 2 degrees/sec by 17.6 degrees .C on the average. At the depth of 2--3 mm the temperature only changed by 4.5 degrees C at the rate of 0.015 degrees/sec. Simultaneous recording of single cold thermoreceptors revealed two types of responses to alteration of the thermode temperature: with rapid increase in the firing rate during cooling and sharp decrease during warming up (18 thermoreceptors); and with slow, gradual change of the firing rate (10 receptors). The data obtained suggest that the cold thermoreceptors are situated in different skin layers. This enables the organism to register the skin temperature gradient as well as the transdermal warmth flows.
D000200:Action Potentials; D000818:Animals; D003080:Cold Temperature; D011817:Rabbits; D012867:Skin / Q000294:innervation*; D012881:Skin Temperature; D013823:Thermoreceptors / Q000502:physiology*
Ob izmenenii impul'satsii kholodovykh termoretseptorov kozhi v zavisimosti ot temperatury razlichnykh ee sloev.