[Depolarization of primary afferents induced by evoked activation of intersegmental connections of the substantia gelatinosa of the spinal cord in the cat].
Primary afferent depolarization evoked by selective activation of intersegmental connections of the substantia gelatinosa was studied in nembutal-anesthetized cats. Intensive depolarization was observed in high-threshold muscle and cutaneous afferents, but it was very weak in group Ia muscle afferent fibres. It is supposed that intersegmental spreading of activity in substantia gelatinosa is transmitted via chains of successively excited neurons. Possible function of primary afferent depolarization is discussed as a factor stabilizing the coordinated activity of spinal neurons.
D000818:Animals; D002415:Cats; D005071:Evoked Potentials; D009132:Muscles / Q000294:innervation; D009475:Neurons, Afferent / Q000502:physiology; D010525:Peripheral Nerves / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D013116:Spinal Cord / Q000502:physiology*; D013126:Spinal Nerve Roots / Q000502:physiology*; D013376:Substantia Gelatinosa / Q000502:physiology*; D009435:Synaptic Transmission
Depoliarizatsiia pervichnykh afferentov, vyzvannaia aktivatsieĭ mezhsegmentarnykh sviazeĭ zhelatinoznoĭ substantsii spinnogo mozga koshki.