Functional coupling between the pyramidal tract and segmental motoneurons in cat and primate.

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Abstract
The effect of motor cortex evoked single and repetitive pyramidal volleys on alpha motoneuron excitability was determined in "pyramidal" cats, baboons and monkeys. A single pyramidal D wave volley evoked no excitability change in cat motoneurons, but such a pyramidal D wave volley in primate preparations evoked prolonged motoneuron excitability changes. Repetitive pyramidal volleys were required to produce motoneuron excitability changes in cat. Unlike the cat, interneurons mediating inhibition in the primate do not require pyramidal volley summation to achieve output levels adequate to influence motoneurons, suggesting an obligatory synaptic relay such as that observed with the initial monosynaptic facilitation.

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