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Related Experiment Videos

Sacculocollic reflex arcs in cats

Y Uchino1, H Sato, M Sasaki

  • 1Department of Physiology, Tokyo Medical College, Shinjuku-ku, Japan.

Journal of Neurophysiology
|June 1, 1997
PubMed
Summary

The sacculocollic reflex uses bilateral pathways, exciting neck extensors and inhibiting neck flexors, unlike the utriculus system. This organization helps maintain head-body position against gravity.

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Area of Science:

  • Neuroscience
  • Vestibular System Physiology
  • Motor Control

Background:

  • The sacculocollic reflex stabilizes the head against gravity.
  • Understanding its neural pathways is crucial for comprehending postural control.
  • Previous research primarily focused on the utriculus system's unilateral innervation.

Purpose of the Study:

  • To elucidate the neuronal connections and pathways of the sacculocollic reflex.
  • To compare the innervation pattern of the sacculus with that of the utriculus.
  • To determine how the sacculocollic reflex contributes to representing spatial orientation.

Main Methods:

  • Intracellular recordings from neck extensor and flexor motoneurons in decerebrate cats.
  • Selective stimulation of the saccular nerve.

Related Experiment Videos

  • Spinal cord transections to identify specific descending tracts (i-LVST, MVSTs/RSTs).

    • Main Results:

    • Saccular nerve stimulation evoked excitatory postsynaptic potentials (EPSPs) in neck extensor motoneurons and inhibitory postsynaptic potentials (IPSPs) in neck flexor motoneurons, bilaterally.
    • Ipsilateral inputs were stronger than contralateral inputs.
    • Pathway analysis revealed ipsilateral lateral vestibulospinal tract (i-LVST) involvement for ipsilateral extensors and medial vestibulospinal tracts (MVSTs)/reticulospinal fibers (RSTs) for contralateral extensors and bilateral flexors.

    Conclusions:

    • Sacculocollic reflex connections are bilaterally symmetrical, with excitation to extensors and inhibition to flexors.
    • This contrasts with the unilateral innervation of the utriculus system.
    • The sacculocollic reflex complements the utriculus system, enabling representation of all three translational spatial degrees of freedom for gravistatic control.