Reciprocal Innervation


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Reciprocal Innervation

 

a reflex mechanism that coordinates motor activity and aids in the coordination of antagonistic muscles: examples are the simultaneous contraction of a joint’s flexors and the relaxation of its extensors. In reciprocal innervation, reflex excitation in a group of nerve cells that innervate particular muscles is accompanied by reciprocal inhibition of activity in other cells functionally related to the antagonists, a process causing the antagonists to relax. Thus, the centers of antagonistic muscles—flexors and extensors—act in opposition during the performance of many motor acts. The mechanism of reciprocal innervation also enables the organism to make coordinated movements, such as those involved in walking, scratching, moving the eyes, and working.

Reciprocal innervation was discovered in 1876 by P. A. Spiro, a student of I. M. Sechenov, and studied in detail by the English physiologist C. Sherrington, who also introduced the term itself. N. E. Vvedenskii and A. A. Ukhtomskii demonstrated that reciprocal innervation is not a rigidly fixed mechanism but a dynamic one: muscles that are antagonistic when making certain movements simultaneously contract when making others, that is, they are synergistic.

The study of excitation and inhibition in solitary nerve cells using microelectrodes began in the 1950’s. This research elucidated the mechanism of reciprocal innervation at the cellular level. Interneurons, which function in the nervous system as relay switches and integrating elements, play a major role in the development of reciprocal relations between the motor neurons that innervate antagonistic muscles.

REFERENCES

Eccles, J. Fiziologiia nervnykh kletok. Moscow, 1959. (Translated from English.)
Sherrington, C. S. Integrativnaia deiatel’nost nervnoi sistemy. Leningrad, 1969. (Translated from English.)
Kostiuk, P. G. Fiziologiia tsentral’noi nervnoi sistemy. Kiev, 1971.
Granit, R. Osnovy reguliatsii dvizhenii. Moscow, 1973. (Translated from English.)

E. T. BLAGODATOVA

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Stretch reflex and reciprocal innervation. Stretching of skeletal muscles around a joint produces contraction of the stretched muscle via excitation of Ia afferent fibers and relaxation of its antagonists by reciprocal Ia inhibition via Ia inhibitory interneurons.
This leads to the third neurological response known as reciprocal innervation or inhibition.
Learning how to use your body's own reciprocal innervation processes requires a step-by-step re-training.

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