[Age-specific features of the movement control system in young schoolchildren].

Analyzing spatial, temporary, and strength characteristics of movements in 7-10-year-old children by using a graphoanalytical method during the reverse exercise test has indicated that overstrain occurs in all units of the structures that ensure formation and implementation of a transitional process. There are increases in regulation errors by 33%, regulation time by 21.5%, system variability by 16%, regulation stability by 19%.

[Medical technological equipment for correction of impaired homeostasis in humans].

The paper considers how to correct impaired human homeostasis and to maintain it at an adequate level, describes some correction methods, such as an original method of intracorporeal detoxification and technical means for the use of these methods, including a perfusion roller pump that has better operating characteristics.

[Comparative study of mechanisms of change in vasomotor sympathetic activity upon stimulation of different structures of the limbic cortex and hypothalamus].

Responses of arterial blood pressure to low- and high-frequency stimulation of different structures of the limbic cortex and hypothalamus were studied in anesthetized and immobilized cats. The low-frequency (5 Hz) stimulation induced depressor reactions, the high-frequency (100 Hz) one-pressor responses. Both kinds of stimulation in the dorsal level of area 25 and of area 23 of the limbic cortex and of the anterior hypothalamus induced similar depressor responses, whereas the hypothalamic structures in the posterolateral region induced only pressor responses.

[Effect of stimulation of the hypothalamus on the rhythmogenic activity of the smooth musculature of the ureters and systemic arterial pressure].

The influence of low- and high-frequency stimulation of anterior, tuberal and posterior hypothalamic areas on the spontaneous rhythmogenesis in the ureter smooth muscles and on arterial blood pressure, was studied in anesthetized cats. High-frequency stimulation of all hypothalamic areas induced pressor responses with activating effects on motor activity of the ureter. The changes in the ureter rhythmic activity were synchronous with those of systemic arterial blood pressure.

[Characteristics of the response of the white rami communicantes to stimulation of different sections of the amygdaloid body].

Electrical responses in L2-L3 white rami to stimulation of cortico-medial, baso-lateral and central amygdaloid nuclei were studied in anesthetized and immobilized cats. The stimulation evoked a similar pattern of sympathetic discharge mostly consisting of a wave with a mean latency of 69.04 +/- 1.

[Mechanism of change in vasomotor sympathetic activity after stimulation of various amygdaloid structures].

The influence of low- and high-frequency stimulation of cortico-medial, baso-lateral and central nuclei of the amygdala was studied in anesthetized cats by means of recording arterial blood pressure and electrical activity of the amygdala. The induced vasomotor effects were compared with the effect of hypothalamic stimulation. The low-frequency stimulation of all amygdaloid nuclei induced depressor reactions, while the high-frequency stimulation of the same areas induced an obvious pressure response.

[Effect of hypothalamic stimulation on the appearance of the early and delayed responses of the somato-sympathetic reflex].

Stimulation of somatic nerves evoked in the cat L2--L3 white rami a late two--wave response. High frequency stimulation of the hypothalamus induced an increase of the blood pressure, facilitation of the first component and suppression of the second component of the late response. The components of the early response were insignificantly affected by the stimulation.

Do sympathetic preganglionic neurones have a recurrent inhibitory mechanism?

In anaesthetized and immobilized cats 32.5% of the intermediolateral sympathetic preganglionic neurones (B2-SPN) in T3, T8-9 and L2 spinal segments can be re-excited antidromically by repeated stimuli only at very long interstimulus intervals (16 ms and more) considerably exceeding the refractoriness of the somata and axons of these neurones. This was observed in the absence of any association with subnormality or other peculiarities B2-SPN axons.

[Discharges in the white rami communicantes evoked by stimulation of various sections of the hypothalamus].

Electrical responses in L2--L3 white rami on stimulation of anterior and posterior hypothalamus were studied in anesthetized and immobilized cats. The stimulation evoked a complex response consisting of waves I, II, and III with mean latency 19.7 +/- 4.

[Recurrent inhibition of the sympathetic pregnaglionic neurons of the lateral horns of the spinal cord].

32.5% of the lateral horn sympathetic preganglionic neurons (B2-SPN) recorded in T3, T8-9 and L2 spinal segments of anaesthetized and immobilized cats were able to respond antidromically to repeated stimuli with time interval (16 ms and more) considerably exceeding the refractoriness of these neurons. This effect was not associated with axonal subnormality.

Antidromic discharges of sympathetic preganglionic neurons located outside of the spinal cord lateral horns.

Responses arising in thin ventral rootlets and antidromic discharges of single sympathetic preganglionic neurons (SPNs) in T(3) and L(2) segments of the cat spinal cord were recorded simultaneously during stimulation of the white rami communicantes in the same segments. It was shown that in addition to the classical lateral horn SPN with B-axons (conduction velocities 3-10 m/sec) there are also ventral horn SPNs which have B-axons with faster conduction velocities (10-20 m/sec) and intermediate zone SPNs with C-axons (conduction velocities 0.98-1.

Study of the early somatosympathetic reflex response.

Using anesthetized cats, we studied the early components of the somatosympathetic reflex in the white rami communicantes of segments T(3) and L(2) in response to stimulation of the corresponding segmental somatic nerves. The results show that the early somatosympathetic reflex is a complex and highly organized response consisting of three typical waves. The shortest latency wave of this reflex was investigated in detail and evidence of its monosynaptic nature was obtained.

[Polysynaptic components of the early somato-sympathetic reflex response in the lumbar white rami communicantes].

The second and third components of early somatosympathetic relfex discharge were studied in anesthetized cats. Polysynaptic components of the early somatosympathetic and propriospinal somatosomatic discharges were compared. Evidence was found that these reflexes have both common and specialized interneurons in their central polysynaptic chains.