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Related Experiment Videos

Cervical input to vestibulocollic neurons.

E E Brink, K Jinnai, N Hirai

    Brain Research
    |July 27, 1981
    PubMed
    Summary

    Cervical afferents influence vestibulocollic neurons, impacting neck reflexes. Responses varied based on preparation, with inhibition predominating in decerebrate cats and excitation in anesthetized cats, revealing supraspinal pathways.

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    Area of Science:

    • Neuroscience
    • Vestibular System
    • Spinal Cord Physiology

    Background:

    • Vestibulospinal neurons are crucial for posture and balance.
    • Neck afferents modulate vestibular reflexes, but their direct influence on vestibulospinal pathways is not fully understood.

    Purpose of the Study:

    • To investigate the responses of vestibulospinal neurons projecting to neck segments (vestibulocollic neurons) to cervical afferent stimulation.
    • To elucidate the role of supraspinal pathways in modulating neck reflexes.

    Main Methods:

    • Extracellular recordings of vestibulospinal neurons in decerebellate or decerebrated cats.
    • Antidromic activation via microstimulation of C2 ventral horn.
    • Stimulation of cervical afferents (C2 ganglion).

    Main Results:

    • Contralateral neck afferents induced similar responses in vestibulocollic neurons as in other vestibulospinal neurons, with response type (excitation/inhibition) dependent on the preparation.
    • In intercollicular decerebrate cats, inhibition predominated (latency ≥ 6 msec), with late excitation.
    • In chloralose-anesthetized cats, early excitation (latency < 6 msec) occurred in over one-third of vestibulocollic neurons.

    Conclusions:

    • Cervical afferents exert significant influence on vestibulocollic neurons via supraspinal pathways.
    • These pathways can modify vestibular reflexes originating in the neck.
    • The observed differences in responses highlight the impact of anesthetic/preparation state on neuronal excitability.

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