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Related Experiment Videos

How do thalamic axons find their way to the cortex?

Z Molnár1, C Blakemore

  • 1Laboratory of Physiology, University of Oxford, UK.

Trends in Neurosciences
|September 1, 1995
PubMed
Summary

Thalamic axons navigate the developing neocortex through a series of signals. Evidence suggests preplate axons act as crucial guides for thalamic innervation, influencing topographic mapping.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Axon Guidance

Background:

  • Thalamic innervation of the neocortex involves complex developmental mechanisms.
  • The precise topographic mapping of thalamic projections is not fully understood.
  • Chemoaffinity alone may not explain the specific connections formed.

Purpose of the Study:

  • To investigate the mechanisms guiding thalamic axon innervation of the neocortex.
  • To explore the role of cortical signals and cellular interactions in this process.
  • To test the 'handshake hypothesis' regarding axon guidance.

Main Methods:

  • Analysis of thalamic axon growth and guidance cues in the developing neocortex.
  • Investigation of cortical influences, including growth promotion and stop signals.
  • Examination of the 'handshake hypothesis' using developmental models and mutant analysis (reeler mouse).

Main Results:

  • The neocortex provides sequential signals influencing thalamic axon growth: promotion, permissiveness, and a stop signal.
  • In vitro studies show non-specific innervation, suggesting in vivo guidance mechanisms are critical.
  • The 'handshake hypothesis' is supported by evidence from the reeler mouse, indicating preplate axons guide thalamic axons.

Conclusions:

  • Thalamic axon guidance to the neocortex is a multi-step process involving cortical signals.
  • Preplate axons play a critical role in guiding thalamic axons, establishing topographic specificity.
  • The 'handshake hypothesis' provides a viable model for understanding thalamocortical axon development.

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