Abstract
Efferent discharges were recorded in nerves to flexor muscles simultaneously with ECG of contralateral motor area, during metrazol-induced seizures. Coactivation of α and γ flexor motoneurons happens in convulsive phenomena related to cortical paroxysmal activity. During the tonic and clonic stages of typical seizures, there is a close temporal correlation between the discharges of the α and γ motoneurons and those of the motor cortex neurons. Convulsive manifestations which occur either without ECG symptoms, or in preparations with interrupted connections between cerebral cortex and spinal cord, follow different patterns and do not show α-γ coactivation. These observations suggest that motor cortex epileptic activity could be responsible for the flexor specific convulsive pattern, including α-γ coactivation.
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