[The suppression of the postsynaptic responses of the trigeminal nucleus motor neurons evoked by stimulation of the central gray substance of the midbrain].

Effects of the midbrain central gray matter (CGM) stimulation on responses of trigeminal motoneurons is investigated. It is shown that the conditioning CGM stimulation suppressed postsynaptic responses of motoneurons, evoked by stimulation of the tooth pulp and high-threshold fibres of the infraorbital nerve. The conditioning CGM stimulation exerts no influence on the antidromic responses of trigeminal motoneurons and jaw opening reflex, evoked by stimulation of the caudal nucleus of the spinal trigeminal tract. It is concluded that suppression of responses of postsynaptic motoneurons in evidently a result of modulation of the afferent flow on the interneuronal level.