Symposium on the Role of the Vestibular Organs in Space Exploration (1970) / Chapter Skim
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THE CEREBELLOVESTIBULAR INTERACTION IN THE CAT'S VESTIBULAR NUCLEI NEURONS
THE CEREBELLOVESTIBULAR INTERACTION IN THE CAT'S VESTIBULAR NUCLEI NEURONS
Pages 183-202
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From page 183... ...
These vestibular and cerebellar impulses converge upon vestibular nuclei neurons in the fashion that the cerebellum is superposed on the reflex arcs which are primarily formed between the vestibular nerve and certain vestibular nuclei cells. On the basis of these observations, an attempt is made to interpret the role of the cerebellum in terms of basic concepts of the control theory.
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From page 184... ...
Penetration of neuronal elements within vestibular nuclei was signaled by the sudden appearance of a membrane potential of -- 40 to -- 70 mV and also of spikes and postsynaptic potentials in response to stimulation of the spinal cord, cerebellum, and vestibular nerve. Localization of impaled neurons was determined by the following procedure (refs.
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From page 185... ...
-- Identification of vestibular nuclei neurons by their antidromic activation. The diagram on the top illustrates axonal projections for five types of neurons.
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From page 186... ...
FIGURE 2. -- Monosynaptic excitation of vestibular nuclei neurons by the vestibular nerve volley.
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From page 187... ...
. Therefore, non-Deiters' vestibular nucleus neurons appear to receive a smaller number of vestibular nerve fibers, each of which has a higher efficacy of synaptic transmission than that of Deiters' neurons.
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From page 188... ...
FIGURE 5. -- Multiple discharges in vestibular nerve fibers which occurred in response to single vestibular nerve stimulation.
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From page 189... ...
origin. The neuronal connections between the vestibular nerve fibers and vestibular nucleus neurons are illustrated in the diagram at the bottom of figure 6.
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1A through M) ; there must be convergence of a number of Purkinje cell axons onto single vestibular nuclei cells.
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chains from Purkinje cell to vestibular nuclei cell and then to motoneurons are illustrated in figure 8D and E With the cerebellar nuclei inserted, the connection from Purkinje cells to the final common motor path becomes multistepped (fig.
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From page 192... ...
-- Axon reflex from the floccular lobe to vestibular nucleus neurons through vestibular nerve fibers. Diagram on the left indicates the arrangement of recording (m)
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From page 193... ...
appear to form a reflex center driven by vestibular as well as medullary inputs, but there is no direct control from the cerebellar cortex. On the other hand, the excitatory signals to dorsal Deiters' neurons and superior vestibular nucleus cells are fed also into the cerebellar cortex and, after being processed there, are returned as inhibitory signals through Purkinje-cell axons that interact postsynaptically in vestibular nuclei cells with the original excitatory inputs (A, C)
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From page 194... ...
The superior vestibular nuclei cells, receiving the vestibular nerve, may innervate oculomotor neurons directly (ref.
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. Examples are those which involve dorsal Deiters' and superior vestibular nuclei cells (figs.
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From page 196... ...
. The pontine nucleus neurons, in turn, project to the cerebellar cortex, chiefly to the hemisphere, having excitatory synapses with the lateral nucleus neurons (Ito et al..
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From page 197... ...
M.: AND MARCO, L A.: Projection to the Spinal Cord From the Medial and Descending Vestibular Nuclei of the Cat.
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KIDOKORO. Y.: Direct Inhibitory Innervation to Teleost Oculomotor Neurones by Cerebellar Purkinje Cells.
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I know this is of special interest to you and should be brought out. Ito: Very strictly speaking, I have to say there is no evidence indicating that any Purkinje cells are excitatory.
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From page 201... ...
SESSION VII Chairman: WOLFGANG A PRECHT Institute for Biomedical Research
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