Brain Mechanisms, Edition: 1St Edition by Giuseppe Moruzzi, Alfred Fessard and Herbert H. Jasper

By Giuseppe Moruzzi, Alfred Fessard and Herbert H. Jasper (Eds.)

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R. JUNG: The most interesting features of presynaptic inhibition at sensory terminals, besides the mechanism of its postulated axon-axonal synapses seem to be its long duration and its large dipole potentiul Jield with electrotonic spread along the posterior roots. Thus Sir John Eccles presents us with a very simple explanation of the slow spinal and dorsal root potentials and possibly also of other slow waves at higher cerebral levels. For a physiologist who believes in the neurone theory it is a great comfort that Sir John found interneurones involved in this inhibition.

SHERRINGTON, C. S. Remarks on some aspects of reflex inhibition. Proc. roy. B, 1925, 97: 519-545. TAKEUCHI, A. and TAKEUCHI, N. Electrical changes in pre- and postsynaptic axons of the giant synapse of Loligo. J . gen. , 1962, 45: 1181-1193. TONNIES, J. F. Reflex discharge from the spinal cord over the dorsal roots. J . , 1938, I 378-390. WALL,P. D. Excitability changes in afferent fibre terminations and their relation to slow potentials. J. Physiol. ), 1958, 142: 1-21. INHIRITORY ACIIONS IN THE SPINAL CORD 19 DISCUSSION F.

E. Hngbnrtli It can be observed that these opposed actions do occur, but of course they have quite different time courses. The facilitation of group Ia monosynaptic action is maximum with simultaneous volleys in the nerves to two flexor muscles of the same joint; and has disappeared at an interval of 20 msec. On the other hand the presynaptic inhibitory action of a group I volley from a flexor muscle has a much slower time course, the latency of action being at least 4 msec with a maximum a t about 20 msec and a total duration in excess of 200 msec.

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