[Impulse coherent component separation study of spontaneous activity of the splanchnic nerve in chronic experiments on dogs]. / Issledovanie estestvennoi aktivnosti chrevnogo nerva sobaki v khronicheskikh opytakh s pomoshch'iu metoda vydeleniia kogerentnykh sostavliaiushchikh v impul'soni forme.

Spontaneous electrical activity was recorded by a two-channel amplifier from the intact splanchnic nerve of the dog in chronic experiments using the method of coherent recording. In the channel which picked up the action potentials first as they propagated, all pulses were delayed for the time interval which the action potentials needed to reach the other channel. Then the pulses from both channels entered a coincidence unit which counted only the simultaneous pulses from both channels. It is found that spontaneous active afferent fibres had 3.7-20 m/s conduction velocities. At the maximum frequency of the coincident oscillations the average conduction velocity was 9.2 +/- 1.0 m/s. When feeding meat to the dog the second group of active afferent fibres was detected. The average conduction velocity in this group was 5.8 +/- 0.7 m/s with a range of 3.7 - 9.2 m/s. The conduction velocities in the efferent fibres ranged from 2.5 to 9.7 m/s and their mean conduction velocity was 3.5 +/- 0.5 m/s.

[Conduction pathways of the solar plexus in dogs]. / Provodiashchie puti solnechnogo spleteniia sobaki

The conduction pathways of dog's solar plexus were studied, using the recording of action potentials of the plexus nerves. Greater splanchnic nerves consists of two groups of afferent A-fibres (conduction velocity of 12-15 and 25-56 m/s), afferent C-fibres (conduction velocity of 0.4-2.0 m/s) and preganglionic B- and C-fibres (conduction velocity of 1.0-12.0 m/s). Afferent A- and and C-fibres pass through the solar plexus ganglia to the dorsal roots; preganglionic fibres terminate synaptically on ganglionic neurons, their axons pass in the peripheral nerves to the viscera. Pathways between the peripheral nerves were found; probably they form peripheral reflex arcs.