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Symposium on the Role of the Vestibular Organs in Space Exploration (1970) / Chapter Skim
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VESTIBULAR ACTIVITY IN THE DESCENDING MEDIAL LONGITUDINAL FASCICULUS
Pages 237-244

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 237...
... in carrying vestibular impulses into the spinal cord has been studied in cats. The amplitude, duration, and latency of the gross motor responses evoked by vestibular stimulation and recorded from cervical and lumbar levels do not show any significant or persistent changes after a selective bilateral disconnection of the descending MLF.
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From page 238...
... The cervical spinal cord was exposed by laminectomy from the third to the seventh cervical vertebrae. In some of the experiments, the dorsal and ventral roots were left intact: in others, the dural cuffs were opened and the dorsal roots sectioned extradurally in order to obtain maximal distance between the distal portion of the roots and the cord.
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From page 239...
... . By eliminating all other extrapyramidal and pyramidal tracts by a high lesion through the central neuraxis, a straight relay between primary and secondary vestibular fibers, exclusively represented by the medial longitudinal fasciculus, is offered in sufficient anatomical isolation from adjacent vestibulofugal connections to provide a favorable situation in which the functional significance of the tract can be evaluated without undue interference (figs.
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From page 240...
... -- Upper traces indicate arrival of MLF volley in spinal cord at the level of microelectrode penetration. Lower traces intracellular records of postsynaptic potentials in radial motoneurons.
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From page 241...
... The interstitiospinal fibers terminate within the dorsal part of lamina VIII and adjacent parts of lamina VII, as do the medial vestibulospinal fibers. While the latter fibers are restricted to the upper half of the cord, the interstitiospinal fibers can be followed the whole cord throughout.
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From page 243...
... SESSION VIII Chairman: WILLIAM D NEFF Indiana University
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Key Terms

  • vestibular stimulation
  • spinal cord
  • longitudinal fasciculus
  • vestibular activity
  • vestibular nuclei

  • deep radial
  • interstitiospinal fibers
  • medial vestibulospinal
  • vestibular nerve
  • ventral roots

  • postsynaptic potentials
  • upper beam
  • longitudinal fasciculi
  • anatomical isolation
  • cervical level

  • lower cervical
  • microelectrode penetration
  • peripheral branches
  • mlf volley
  • vestibulospinal fibers

  • descending medial
  • inhibitory postsynaptic
  • descending vestibulofugal
  • midthoracic levels
  • recording purposes

  • vestibular fibers
  • intercostal nerves
  • segmental response
  • radial nerve
  • laboratory animal


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