[Effect of electrostimulation "hunger center" of lateral hypothalamus on the impulse activity of masticatory muscles in unfed and fed rabbits in the absence and the presence of food].
In chronic experiences on rabbits the influence of electrostimulation of "the hunger centres" of the lateral hypothalamus (LH) on impulse activity of chewing muscles of rabbits under the conditions of hunger and satiation was studied. It is established, threshold irritation of the LH of hungry and preliminary fed animals in the absence of food caused the occurrence of incessant search behavior which was followed by the regular generation of bursts of AP by masseter and mylohyoideus muscles with bimodal distributions of interpulse intervals. Such reaction of chewing muscles during irritation of the LH in the absence of food is an example of advancing type reaction. The increase of level of alimentary motivation, arising at threshold irritation of the LH of rabbits under the conditions of hunger and satiety during the resultant food-intake behavior, increased frequency of generation of bursts of AP in a phase of the capture of food, but did not influence on this indicator in a phase of chewing of food. The received results testify about descending stimulating influences of alimentary motivational excitation on neurons of the chewing centre in medulla and on impulse activity of chewing muscles.
Iu P
IuP
Ignatova
A A
AA
Kromin
D000818:Animals; D004558:Electric Stimulation; D055724:Electrophysiological Phenomena; D006815:Hunger / Q000502:physiology*; D007031:Hypothalamus / Q000502:physiology*; D008410:Masticatory Muscles / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology*; D011817:Rabbits