Abstract
Synaptic bases of reversal of the orbital cortically induced inhibition of the masseteric reflex into facilitation, as well as the abolition of the orbital cortically evoked efferent discharge in the digastric nerve, both caused by transection of the brainstem at the pontobulbar junction, were studied by intracellular recording from massicatory motoneurons in the cat. The facilitation of the masseteric reflex was shown to be due to EPSPs in jaw closer motoneurons instead of disinhibition, and the abolition of the efferent digastric nerve discharge due to drastic reduction or even loss of EPSPs in anterior digastric motoneurons instead of active inhibition.
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