[Electrophysiologic study of propagation of excitation in the cat pterygopalatine ganglion].
Action potentials were studied in nerves of the cat pterygopalatine ganglion evoked by stimuli applied to other nerves of the ganglion (in situ). It is established that most fibres passing through the ganglion are continuous sympathetic postganglionic fibres (not less than 3 groups). Most parasympathetic preganglionic fibres are synaptical on the ganglionic neurons and are represented by a group of fibres with the same threshold of excitation. Intracellular recording from single neurons of the pterygopalatine ganglion showed that stimulation of the Vidian nerve caused orthodromic spikes with short latency in one group of neurons and spikes with long latency in other neurons (2.5-6 ms and 10-40 ms respectively). Only fast fibres appear to terminate on most neurons of the ganglion, and only slow fibres do on some other neurons. Tonic activity was not observed when was performed from intact nerves of the pterygopalatine ganglion. The interacellular recording from single neurons of the ganglion showed that frequency of spike potentials either is low (1-3 per second) in some neurons or the potentials are absent in general in other neurons.
D000818:Animals; D002415:Cats; D004594:Electrophysiology; D005725:Ganglia, Autonomic / Q000502:physiology*; D008564:Membrane Potentials; D010275:Parasympathetic Nervous System / Q000502:physiology*; D011930:Reaction Time; D013564:Sympathetic Nervous System / Q000502:physiology; D013570:Synaptic Membranes
Elektrofiziologicheskoe issledovanie provedeniia vozbuzhdeniia v krylonebnom ganglii koshki