[Action potentials of cat masseter muscle motor neurons evoked by stimulation of low-frequency infraorbital nerve afferents].
The responses of masseter motoneurons evoked by stimulation of the low-threshold infraorbital afferents by different number of stimuli were investigated in cats under chloralose-nembutal anesthesia. It is shown that 3-4 succesive stimuli (1.2 of threshold) evoked action potentials in masseter motoneurons if their frequency was above 300/s. Stimulation of the infraorbital nerve by paired stimuli produced action potentials in these motoneurons when the interval between the stimuli was 1.3-4.0 ms. With longer intervals only facilitation of the second EPSP was observed, the degree of facilitation varying from 0.2 to 1.0. A conclusion is made that the masseter motoneurons discharges can be produced by activation of the infraorbital nerve. A -fibres probably connected to rapidly adapting receptors of the vibrissae.
D000200:Action Potentials; D000818:Animals; D002415:Cats; D008409:Mastication; D008410:Masticatory Muscles / Q000294:innervation*; D008442:Maxillary Nerve / Q000502:physiology*; D009046:Motor Neurons / Q000502:physiology*; D009475:Neurons, Afferent / Q000502:physiology; D012018:Reflex / Q000502:physiology*; D011984:Sensory Receptor Cells / Q000502:physiology
Potentsialy deĭstviia motoneĭronov zhevatel'noĭ myshtsy koshki, vyzvannye stimuliatsieĭ nizkoporogovykh afferentov podglaznichnogo nerva.