[The neuronal electrical responses of the superior cervical ganglion in the rabbit to nociceptive skin stimulation]. / Elektricheskie otvety neironov verkhnego sheinogo gangliia krolika na notsitseptivnoe razdrazhenie kozhi.

The patterns of tonic activity in the neurons of rabbit superior cervical ganglion at rest and during noxious stimulation of the skin were studied using intracellular recording. According to reflex changes in the activity patterns, all neurons studied were classified into three groups. Cardiac rhythmicity is more pronounced in the neurons of the second type than in those of the first type. The magnitude of the cardiac rhythmicity in both types of neurons was reduced after noxious stimulation of the skin. In the third type of neurons the cardiac rhythmicity was absent. In some neurons slow excitatory and inhibitory postsynaptic potentials appeared resulting from skin stimulation.

Human sympathetic electrical activity recorded with skin surface electrodes.

Spontaneous electrical activity correlated to cardiac rhythm has been recorded with electrodes placed on the surface of the human arm or using the rabbit hindlimb. The signal-to-noise ratio has been improved using record averaging synchronized with the ECG. The recorded activity in man is a slow negative wave of sinusoid-like shape with a mean peak amplitude 0.08 +/- 0.03 microV. The sympathetic origin of this activity is suggested by the facts that its time course and conduction velocity are similar to those of integrated spontaneous electrical activity, recorded directly from postganglionic sympathetic fibers in the rabbit, and that it can be recorded from skin surface as a response to direct electrical stimulation of sympathetic nerve in the same animal.

[Natural electrical activity of human sympathetic nerve fibers recorded from the body surface]. / Estestvennaia élektricheskaia aktivnost' simpaticheskikh nervnykh volokon cheloveka, zaregistrirovannaia ot poverkhnosti tela.

The electrical potentials recorded from human forearm were stored and averaged as synchronous with the cardiac rhythm. The R-wave of the ECG was used to synchronize the averaging system. The record obtained with this technique from human forearm during transient stop of blood flow to avoid mechanical artifacts was a sinusoid-like curve with peaks between the R-waves of the ECG. The nature of this electronegative wave was investigated by means of comparing electrograms and rheograms recorded from forearm of normal subjects and subjects after denervation or desympathization of their upper extremities. The data obtained suggest that the electronegative wave recorded with this technique is the averaged sum of tonic pulse-synchronous electrical activity of sympathetic nerve's fibers innervating vasoconstrictors of the skeletal muscle.

[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.

[Study of the natural activity of nerve fibers using the method of multi-channel coherent recording]. / Issledovanie estestvennoi aktivnosti nervnykh volokon s pomoshch'iu metoda mnogokanal'nogo kogerentnogo priema.

Spontaneous electrical activity was recorded with a six channel amplifier from the intact vagal nerve (cervical area) of the cat in acute experiments. The records obtained were summated using different delays between them induced by a computer for differentiation of the afferent activity from the efferent one and estimation of the proper conduction velocity. It is found that the most active afferent fibres have conduction velocity about 25 m/s.

[Afferent impulse of fibers of the vagus nerve of cats using the method of coincidence of outgoing action potentials]. / Issledovanie afferentonoi impul'satsii volokon bluzhdaiushchego nerva koshki pri pomoshchi metoda sovpadeniia otvodimykh potentsialov deistviia

Tonic electrical activity of afferent fibres of intact vagus nerve was studied in cats using the method of coincidence of recorded action potentials. It was found that tonically active afferent fibres of the intact vagus nerve of the cat had conduction velocity 8-65 m/s. Two groups of fibres conducting the most intensive impulsation from the pulmonary stretch receptors were found. At the maximum frequency of the coincident oscillations the average conduction velocities in these two groups was 29.4 plus or minus 1.4 and 41.0 plus or minus 2.5 m/s. The frequency of oscillations was modulated by respiration.