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Symposium on the Role of the Vestibular Organs in Space Exploration (1970) / Chapter Skim
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MULTISENSORY INFLUENCE UPON SINGLE UNITS IN THE VESTIBULAR NUCLEUS
Pages 203-208

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From page 203...
... in the vestibular nucleus is discussed from the standpoint of its significance for rapid, reflex, postural adjustments and postural stability. INTRODUCTION Head-position information is provided by the vestibular labyrinth: The otolith organs signal the axis of rotation relative to gravity, whereas the axis of rotation relative to the head is monitored by the semicircular canals.
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From page 204...
... , handclaps and whistles, galvanic stimulation (0.05 to 0.12 mA) delivered through round-window membrane electrodes, and, finally, somatosensory stimulation which included blowing on the fur, gently touching the skin, deep muscle pressure, and joint movement.
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From page 205...
... . The maximum rate of neuronal discharge appeared to correspond with the maximum joint displacement; however, an exact evaluation of the joint angle versus neuronal discharge was not carried out.
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From page 206...
... cerebellectomy did not abolish or grossly alter the somatic influence upon vestibular units. The possibility that some somatic impulses ascend via the reticular formation cannot be excluded; however, in a similarly constructed parallel study, Potthoff, Richter, and Burandt found far fewer neuronal responses to joint movement in the bulbar and pontine reticular formation (ref.
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From page 207...
... MAGNUS. R.; AND STORM VAN LEEUWEN, W.: Die Akuten und die dauernden Folgen des Ausfalles der tonischen Hals und Labyrinthreflexe.
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From page 208...
... We did not closely study the effect of degrees of neck deviation versus neuronal activity. We did for a few of the limb joint neurons as it was much easier to more exactly ascertain the limb joint angle, but certainly small degrees of movement of the neck did cause activation.
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Key Terms

  • joint movement
  • reticular formation
  • muscle pressure
  • deep muscle
  • single units

  • postural adjustments
  • central nervous
  • joint responses
  • vestibular nuclei
  • reciprocal joint

  • limb joint
  • joint stimulation
  • descending vestibular
  • maximum joint
  • vestibular labyrinth

  • joint input
  • vestibular responses
  • joint angle
  • units responded
  • versus neuronal

  • rotation relative
  • dorsal roots
  • responses exceeded
  • neuronal activity
  • discharge rate

  • nucleus responsive
  • steady position
  • position information
  • nuclear complex
  • discharge patterns


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