[Contribution of antidromic activity, induced by excitation of efferent fibers, to massive potentials of the cat spinal cord].
Biphasic cord dorsum potentials (CDP) were evoked on the cat spinal cord by stimulation of the distal stump of a cut ventral root (V-CDP) or peripheral nerves (N-CDP) with the cord deafferentation in L5-S1 segments. Measurements of their latency and the threshold in the responsible efferent fibres have shown that they were produced mainly by the activity of the low-threshold fibres in the ventral root. Stimulation of peripheral nerves with cord deafferentation has demonstrated a change in the amplitude of the positive presynaptic component of the "standard" CDP. Application of double stimuli on dorsal and ventral inputs has elicited two maxima of V-CDP depression. This depression is connected with developed orthodromic mono- and polysynaptic reflexes in motoneurons. The data obtained confirm that the investigated V-CDP is a component part of the "afferent" spike of standard CDP evoked by stimulation of intact nerves. Such data for main hindlimb nerves of the cat are adduced. A conclusion is drawn that integrity of efferents may be determined by analysis of presynaptic spikes of CDP.
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Shugurov
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D000818:Animals; D002415:Cats; D003714:Denervation; D004525:Efferent Pathways / Q000502:physiology; D005071:Evoked Potentials / Q000502:physiology; D006614:Hindlimb / Q000294:innervation; D009412:Nerve Fibers / Q000502:physiology*; D010525:Peripheral Nerves / Q000502:physiology; D013116:Spinal Cord / Q000502:physiology*; D013126:Spinal Nerve Roots / Q000502:physiology
Vklad antidromnoĭ aktivnosti, vyzyvaemoĭ vozbuzhdeniem éfferentnykh volokon, v massovye potentsialy spinnogo mozga koshki.