Abstract
Experiments were performed to determine whether the lateral hypothalamic area which influences the locomotor activity of rats has any effect on the reflex electrical discharges over the ventral roots of spinal nerves. Reflex discharges were recorded from third lumbar ventral roots following stimulation of the corresponding dorsal roots in control rats and in rats with hypothalamic lesions. The amplitude and area of the ventral root discharges in rats with lesions were significantly decreased from the control level. Central delay also was slightly increased in rats with hypothalamic damage. On the other hand, electrical stimulation of this lateral hypothalamic area caused an increase in the ventral root discharges and a decrease in central delay. These data support the hypothesis that the lateral hypothalamus affects spontaneous locomotor activity by altering the excitability of spinal motoneurons.
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