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Related Experiment Videos

Spinal network of the Mauthner cell.

J R Fetcho1

  • 1Department of Physiology, State University of New York, School of Biomedical Sciences, Buffalo.

Brain, Behavior and Evolution
|January 1, 1991
PubMed
Summary

Mauthner cells in fish and amphibians initiate rapid escape by bending their bodies. This involves exciting muscles on one side and inhibiting them on the other via a complex spinal network.

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Area of Science:

  • Neuroscience
  • Comparative Physiology
  • Evolutionary Biology

Background:

  • Swimming vertebrates like fish and amphibians use Mauthner cells for predator escape.
  • Escape behavior involves a rapid body bend initiated by Mauthner cell activation.
  • Mauthner cell axons extend the length of the spinal cord.

Purpose of the Study:

  • To elucidate the spinal network mechanisms underlying Mauthner cell-initiated escape.
  • To understand how Mauthner cells coordinate muscle excitation and inhibition for body bending.
  • To identify conserved features of axial motor networks in vertebrates.

Main Methods:

  • Analysis of Mauthner cell spinal output pathways.
  • Investigation of motoneuron and interneuron excitation and inhibition.
  • Comparative analysis with spinal networks in lampreys and embryonic frogs.

Main Results:

  • Mauthner cells excite ipsilateral primary motoneurons and descending interneurons.
  • Commissural interneurons mediate contralateral motoneuron and interneuron inhibition.
  • This coordinated excitation and inhibition generates the characteristic C-bend escape response.

Conclusions:

  • The Mauthner cell circuit provides a powerful, rapid escape mechanism.
  • Spinal networks for escape share primitive features across vertebrate evolution.
  • Understanding these networks offers insights into the evolution of motor control.

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