[Effect of brain stem lesions on hibernation of the hamster (Cricetus cricetus L.)].
Small lesions in the brain stem (including the hypothalamus) of the European hamster were effective with respect to food intake, hibernatory disposition and thermogenic power (oxygen consumption) as well. Hyperphagia was accompanied by depression of hibernation mostly. Moreover, hibernation was hindered by impairment of the thermogenic capacity. Entrance into hibernation depended on the integrity of the middle and caudal hypothalamic areas and the rostral portions of the pons and midbrain. Hyperphagia resulted from destruction of the middle (ventromedial) hypothalamic and caudal hypothalamic areas, including transition structures to the pons. A depression of thermogenesis against cold was observed after destruction of supramammillary and neighbouring mesencephalic areas. Supplementary results: An annual metabolic rhythm characterized by a minimum in december has been established once more. Urethane anesthesia did not abolish cold thermogenesis, despite the development of a slight hypothermia. Poikilothermia resulting from brain stem damage disappeared during a three-day period. Furthermore, diencephalic lesions did not suppress arousal from hibernation significantly.
D000818:Animals; D001833:Body Temperature Regulation; D001933:Brain Stem / Q000293:injuries / Q000502:physiology*; D003080:Cold Temperature; D006224:Cricetinae / Q000502:physiology*; D004027:Diencephalon / Q000502:physiology; D006605:Hibernation; D007031:Hypothalamus / Q000502:physiology; D010101:Oxygen Consumption
Der Einfluss von Hirnstammläsionen auf den Winterschlaf des Hamsters (Cricetus cricetus L.)