EFFECT OF INTRAHYPOTHALAMIC PHENTOLAMINE ON HYPOTHERMIA PRODUCED BY PERIPHERAL NORADRENALINE IN THE PIGEON

Abstract

1 The effect of intrahypothalamic phentolamine (1 and 1 microliter of a 10 microgram/microliter solution) on hypothermia induced by intramuscular injection of noradrenaline (NA, 2 mg/kg) at different times (2, 10, 20 min) after phentolamine was investigated in pigeons. 2 Administration of phentolamine shortly before NA was shown to attenuate hypothermic responses to NA. 3 It is suggested that the attenuation is due to blockade of central hypothermic effects of intramuscular NA. 4 The mapping of injection sites in the brains was carried out.