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Related Experiment Videos

The control of neuron number.

R W Williams1, K Herrup

  • 1Section of Neuroanatomy, Yale University School of Medicine, New Haven, Connecticut 06510.

Annual Review of Neuroscience
|January 1, 1988
PubMed
Summary

Nervous system development occurs in three overlapping phases: genetic, embryonic, and functional. This framework helps understand how neuron numbers are controlled from genetic blueprints to mature brain function.

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Area of Science:

  • Neuroscience
  • Developmental Biology

Background:

  • Nervous system development involves intricate processes to establish correct neuron numbers.
  • Understanding these processes is crucial for comprehending brain formation and function.

Purpose of the Study:

  • To present a three-phase model for understanding nervous system development and neuron number control.
  • To delineate the distinct characteristics and mechanisms of each developmental phase.

Main Methods:

  • Conceptual framework integrating genetic, embryonic, and functional stages of development.
  • Analysis of cellular interactions, genetic programming, and environmental influences on neuron number.

Main Results:

  • Phase 1 (Genetic): Abstract genetic intentions guide initial neuron production and cell death programming.
  • Phase 2 (Embryonic): Interactive cellular processes and environmental cues refine neuron numbers and glial cell matching.
  • Phase 3 (Functional): Post-functionalization adjustments refine neuronal organization, synapse, and receptor density.

Conclusions:

  • A three-phase model provides a comprehensive view of nervous system development and neuron number regulation.
  • Neuron number control is a dynamic process involving genetic, interactive, and functional adjustments throughout life.

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