Living Structures Classified According To Their Manifestation Of Slow Rhythmic Processes

The different muscles, the smooth muscles in particular, are characterized by slow rhythmic processes both mechanical and electrical in character. Measurement of the membrane potential of earthworm smooth muscle (Biilbring, 1957) showed that it undergoes oscillatory changes with at least two different rhythms. One has a period of 1 sec, with a spike potential occurring spontaneously at the peak of a slow potential oscillation. The other has a period of about 1-3 min and is equal to the period...

Method Of Investigating Cortical Impedance

Electrolytes and function of the central nervous system The works of Vvedenskii and his school, Verigo (1901), Chagovyets (1898), Lazarev (1916), and others include a mass of factual data as well as a theoretical analysis of the effect of ions on nervous tissue. Recent investigations have disclosed details of the distribution and movement of ions in the process of nerve excitation. This research progress was greatly helped by advances made in the method of measuring impedance (Cole and Curtis,...

Summary

According to Orbeli's theory, two trends can be distinguished in the evolution of living structures in their reaction to stimulation. Some structures are developing increasing chemical sensitivity and function in a close relationship with the chemical factors in the environment. Others are losing their chemical sensitivity and becoming more subject to control by nerve impulses. Examination of comparative physiological material shows that the first structures are characterized by a slow...

S3 H B X

D.c. amplifier (I) with stabilized plate supply (II and III) (II) rectifier for 500-1000 V (III) rectifier for 150-300 V. Types of tubes are according to Russian standards. the second is designed for low voltage (about 300 V) to power the second stage. The tube filaments are heated by storage batteries. A needle millivoltmeter (R 100.O.) and the 5T loop of an MPO-2 loop oscillograph are connected in series at the amplifier output. Average gain (with 1 mV input) provides a beam...

Waking Animal

A recording method using macro- and microelectrodes Infraslow potential oscillations (ISPO) can be recorded both in chronic experiments with implanted electrodes and in acute experiments. In most chronic experiments, the oscillations were recorded from the surface of the rabbit cerebral cortex by means of silver or platinum electrodes in the form of round discs 2-4 mm in diameter. Pairs of * Due to the difficulty of translating the Russian terms sekundnyi, minutnyi and chasovoi ritm, the...

Info

Impedance and bioelectrical activity of the rabbit visual cortex after the injection of phosphacol. Under each oscillogram mark of flashing light in contralateral eye. (a) intravenous injection of 0.3 mg kg of phosphacol (b) intravenous injection of 10 mg kg of atropine (c) second injection of 0.2 mg kg of phosphacol. The dotted line of curve R designates the period of rhythmic oscillations of resistance (not shown). Top right, continuation of curves. Figures on the left correspond to...

Infraslow Potential Changes In Nuclei Of Subcortical And Upper Brain Stem Structures

Analysis of the pathways by which the ISPO are intensified and the lag in appearance of the response to stimulation of the hypothalamus show that neurohumoral relations play a role in the phenomenon of infraslow oscillations. The hypothalamus is a structure that controls the level of activity of the endocrine glands. It performs this function in accordance with the information reaching it both from the cortex and from the subcortical structures (reticular formation of the brain stem, amygdaloid...

B

Appearance of high-frequency ISPO in different regions of the cerebral cortex after' repeated stimulation of the right .eye with rhythmic flashing of a light. (A) sensorimotor cortex of the left hemisphere (B) sensorimotor cortex of the right hemisphere (C) visual cortex of the left hemisphere. Recordings are presented for each region made before (top) and after (bottom). Frequency of light flashes 8 per sec,duration of a single application of the stimulation 15 sec, number of...