The effects of bilateral cervical vagotomy on the blood levels of corticosterone, and catecholamines, adrenaline (A) and noradrenaline (NA), in pigeons, were studied. Plasma levels of corticosterone and NA were found to be significantly higher and of A lower, in the vagotomized (VgX) pigeons as compared to their sham-operated (VgS) controls. These changes in VgX pigeons are explained as caused mainly by the lack of the vagal tone.
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