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In animali a ventilazione controllata l'iniezione di NaCN attraverso l'arteria tiroidea provoca bradicardia, ipertensione ed aumento dell'attività nervosa respiratoria. In queste condizioni, le modificazioni del livello della pressione arteriosa sistemica mascherano l'effetto puro della stimolazione chemocettiva sul simpatico cardiaco. Per evitare che l'attività simpatica subisca modificazioni secondarie alla variazione dell'input barocettivo, è stato guidato artificialmente il battito cardiaco...
The masseteric reflex elicited by electrical stimulation of the mesencephalic trigeminal nucleus (MTN) was influenced by electrical stimulation of the central stump of the vagal nerve and of the reticular formation in the duck; the vagal nerve exerted predominantly inhibition while the reticular formation could inhibit or enhance the jaw reflex movements: increase was the most common effect. Unitary discharge of the MTN was recorded in curarized ducks by means of tungsten microelectrodes. Units...
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