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- W2022648222 abstract "The responses of single alpha motoneurons to various ‘natural’ stimuli were recorded from dissected ventral root filaments in lightly anesthetized control and recently decerebellate cats. The identity of the motoneurons was established by recording the unitary responses to orthodromic stimulation of nerves innervating the triceps surae muscles in the hindlimb. We recorded only the activity of units which responded to electrical stimulation of the medial or lateral gastrocnemius nerves, though some units responded to stimulation of both these nerves, and some also responded to stimulation of the posterior tibial nerve. The distributions of unit latencies and amplitudes did not differ between the two groups of animals. Baseline firing rates were also similar. However, unit firing rates in response to neck extension, ipsilateral hindfoot dorsi- or ventral-flexion were significantly higher in decerebellate than in control cats. The discharge rates in response to other stimuli, including neck flexion, pinna stimulation, and noxious stimulation in the hindlimb, were not significantly different between the two groups. Since the alpha motoneurons showed an increase in responsiveness only to some stimuli, specific mechanisms probably explain this release. The most important mechanism seems to be a loss of inhibition normally exerted by the cerebellum on vestibular and joint proprioceptive reflexes. The pathways to the ventral horn cells are thought to involve the vestibulo-spinal and reticulo-spinal tracts." @default.
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- W2022648222 date "1975-09-01" @default.
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- W2022648222 title "Alpha motoneuron responses to natural stimuli in decerebellate cats" @default.
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- W2022648222 doi "https://doi.org/10.1016/0006-8993(75)90208-5" @default.
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