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The blood flow of thyroid, adrenal cortex and renal cortex in the pentobarbital anesthetized rat was assessed from hydrogen gas desaturation curve. The microcirculation of thyroid was markedly augmented within 2 min after an intraventricular injection of Thyrotropin-Releasing Hormone (TRH) while Met-Enkephalin (ENK) failed to influence. Both TRH and ENK stimulated the microcirculation of adrenal cortex moderately. ENK diminished the microcirculation of renal cortex whereas TRH did not exert any effect. The response of thyroid to TRH was abolished by vagotomy, thus the existence of a specific TRH-vagus -thyroid connection was indicated.

Central nervous system mediated stimulation by thyrotropin-releasing hormone of microcirculation in thyroid gland of rats.