Minimal synaptic actions of pyrimidal impulses on some alpha motoneurones of the baboon's hand and forearm
The Journal of PhysiologyPublished 1 April 1962Open access
S. Landgren, C. G. Phillips, R. Porter
Citations205
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Neuroscience
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Investigations to the motor cortex of a primate, the common African baboon, are extended to incorporate the method of intracellular recording from pyramidal neurones because it seemed unlikely that the modes of direct and synaptic excitation of these neurones would differ materially from those already seen in the cat.
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Experiments on cats found that pyramidal activation of the motoneurones in the cervical region of the same animal was also of internuncial order, and on the basis of electromyographic studies in monkeys, Cooper and Denny-Brown * concluded that in this animal there is a complex relay system at the segmental level between the Pyramidal fibers and the spinal motoneurs in the lumbar region.
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This paper presents an extensive investigation of the properties of the cells of origin of the ventral spinocerebellar tract (VSCT) and concludes that all or almost all neurones with contralaterally ascending axons and ipsilateral mono- neurones are of special interest.
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In observations on the motor cortex of the red monkey (Erythrocebus patas) it was found that single pulses of adequate duration elicited solitary movements of thumb and index from a large area which overlapped, medially, another large area from which similar movements of the hallux could be provoked.
