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The electrical activity of single neurons of the sympathetic ganglia of the frog



The electrical activity of single neurons of the sympathetic ganglia of the frog



Fiziol Zh Sssr Im I M Sechenova 50(7): 828-834



A study was made of the bioelectric activity of neurons of the 10th and 9th ganglia of the sympathetic trunk. Stimulation was applied by single impulses (0.2 milliseconds every 2 seconds) either to the sympathetic trunk in the area of the 5th or 4th ganglia, or to the connecting branches of the 5th to the 8th ganglia (orthodromal stimulation), or to the spinal nerve (antidromal stimulation). Ordinary glass microelectrodes were used for leads. The response of the preganglionic fiber with extracellular leads developed in the form of a biphasic positive and negative wave with a latent period of 2-3 milliseconds. The positive phase had an amplitude of 8-15 millivolts and lasted 2-3 milliseconds. The negative phase had a smaller amplitude but lasted longer (10 milliseconds to 1.1 seconds). The response of the preganglionic fiber with an intracellular lead had the shape of a single peak with an amplitude of 20-30 millivolts and a duration of 3 milliseconds and was followed by either an electronegative phase or a period without potentials. The maximum rate of stimulation reproducible by a preganglionic fiber was more than 100 cycles/second, The response of the postganglionic neuron with an extracellular lead was biphasic. Its first, positive phase (amplitude 10-12 millivolts, duration 2-3 milliseconds) preceded the excitatory postsynaptic potential. With antidromal stimulation the excitatory postsynaptic potential was absent. The negative phase had the same or less amplitude but lasted 3-8 times as long as the positive phase. The amplitude of the resting potential of the postganglionic neuron was 27-80 millivolts; the amplitude of the action potential with an intracellular lead was 30-75 millivolts. When stimulation of the preganglionic fibers was reduced, no excitatory postsynaptic potential without a peak was observed: this showed the absence of convergence of the preganglionic fibers in the neurons of the ganglia of the sympathetic trunk of the frog, unlike the sympathetic ganglia of warm-blooded animals.

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