V A Iakhnitsa

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Experiment on cats under chloralose-nembutal anaesthesia has shown that 65% responses of caudal trigeminal nucleus neurons to the activation of the tooth pulp, A alpha and/or A delta infraorbital nerve afferents were completely suppressed by conditioning stimulation of the central grey matter (CGM) by a train of stimuli (10-20) that followed with the rate(More)
Studies of spontaneous firing (SF) in the midbrain periaqueductal gray (PAG) neurons before and after stimulation of nucleus raphe magnus, locus coeruleus and substantia nigra were performed on the rat anesthetized with Hexenal (200 mg/kg). Three types of neurons different in SF structure were found. Stimulation of indicated structures increased SF rate in(More)
Effect of sections of the spinal trigeminal tract and caudal nucleus of the spinal trigeminal tract on the high-threshold jaw-opening reflex (HJR) evoked by tooth pulp stimulation and the low-threshold jaw-opening reflex (LJR) evoked by stimulation of the A-alpha infraorbital nerve fibres as well as on the suppression of these reflexes by the central grey(More)
Effect exerted by stimulation of the central grey matter (CGM) of the midbrain and nucleus raphe dorsalis (nRD) by a short train of stimuli (20) followed with the rate of 400/s on the high-threshold jaw-opening reflex (HJOR) evoked by electrical irritation of the tooth pulp was studied during serotonin synthesis blockade after parachlorphenylalanine (pCPA)(More)
Three types of neurons which exhibit spontaneous firing were found in the midbrain periaqueductal grey. The stimulation of monoaminergic structures did not change the firing of the first and second types of neurons but suppressed the third one.
Effect of stimulation of midbrain central grey (CG) and raphe nuclei (RN) on jaw opening reflexes evoked by excitation of high-threshold (tooth pulp) and low-threshold (A-alpha infraorbital nerve fibres) afferents was studied in cats under chloralose-nembutal anesthesia. High-threshold jaw opening reflex (HJR) was effectively suppressed after conditioning(More)
Motor cortex stimulation induced inhibition of the background activity (BA) in 47% periaqueductal gray neurons, excitation--in 20% and had no influence in 32% neurons. Most of the activated neurons (67%) had the 3d type of BA. Neurons with the 1st type of activity did not respond to the cortex stimulation.
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