[The initiation of cold shivering during the local heating of the rat hypothalamus under immersion hypothermia].

A local artificial heating of the hypothalamic centre of thermoregulation in rats subjected to immersion cooling to a deep hypothermia activated a shivering. The data obtained suggest that one of the reasons of disorders in the organism thermoregulatory functions under conditions of a deep hypothermia involves a direct effect of the cold upon the thermoregulation centre in the hypothalamus.

[The neuronal reaction of the rabbit thalamus to thermal stimulation of the skin].

Skin temperature of the rabbit back and face was increased to 38-40 degrees C or decreased to 22-26 degrees C. Out of 48 units under study 10 neurons responded to the cold skin stimulation, the latency of the responses varying from 10 to 50 s. The thalamic neurons responded also to the light, sound and mechanical stimuli.

[The "thermoresponsive" neurons of the thermoregulation center and their functional characteristics].

The specific features of responses to thermal stimulation of the skin in neurons of the thermoregulation centre in the anterior and posterior hypothalamus were investigated in rabbits. Separate neurons were found to respond to temperature changes like skin thermoreceptors. A part of thermal signals from the skin is supposed to arrive to the thermoregulation centre without specific transformation.

[Heat transfer by the blood in the venous vessels of the rabbit under different temperature conditions].

The blood temperature in the main venous vessels reflects the formation of the heat balance in the body. In the rabbit posterior vena cava, the temperature increased by 0.19 degrees C-0.