[Transmission of excitation through the superior cervical ganglion at an early stage of postnatal development]. / Provedenie vozbuzhdeniia cherez verkhnii sheinyi ganglii na rannem étape postnatal'nogo razvitiia.

The action of hexonium, d-tubocurarine, phentolamine and atropine on synaptic transmission in the superior cervical ganglia of rabbit, cat and rat was studied at early postnatal stages (1-8 days after birth). It was shown that hexonium and d-tubocurarine (intravenous injection or addition to Kreb's solution) inhibit the transmission of excitation in the ganglia both in situ and in vitro. No difference was found in the action of phentolamine and atropine on synaptic transmission in the ganglia of newborn and adult animals. A conclusion is made that synaptic transmission in sympathetic ganglia at early postnatal stage is cholinergic.

[Influence of sympathetic fiber stimulation on conduction of excitation in the cat pterygopalatine ganglion]. / Vliianie razdrazheniia simpaticheskikh volokon na provadenie vozbuzhdeniia v krylonebnom ganglii koshki

Interaction between excitation passing through parasympathetic and sympathetic pathways was studied by recording of action potentials evoked in postganglionic nerves of the cat pterygopalatine ganglion by both testing stimuli applied to the greater superficial petrosal nerve and conditioning stimuli applied to cervical sympathetic nerve. Depression of synaptic transmission through the ganglion is shown to take place under stimulation of the cervical sympathetic nerve. The magnitude of such inhibition reached to 13 +/- 3%.

[Electrophysiologic study of propagation of excitation in the cat pterygopalatine ganglion]. / Elektrofiziologicheskoe issledovanie provedeniia vozbuzhdeniia v krylonebnom ganglii koshki

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.