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Initial tract formation in the mouse brain

S S Easter1, L S Ross, A Frankfurter

  • 1Department of Biology, University of Michigan, Ann Arbor 48109-1048.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 1, 1993
PubMed
Summary
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This study maps early neuron and axon development in mouse embryos (E8.5-E10.5), identifying the first neurons and tracts. It reveals the timing and location of key neural structure formation during embryonic development.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Embryology

Background:

  • Early neuronal development is crucial for brain formation.
  • Understanding the initial stages of axon and tract formation provides insight into neural circuit assembly.

Purpose of the Study:

  • To map the emergence and trajectory of the first neurons, axons, and tracts in the developing mouse brain.
  • To establish a temporal and spatial atlas of early neurogenesis from embryonic day 8.5 to 10.5.

Main Methods:

  • Immunohistochemical labeling of neuron-specific class III beta-tubulin in whole-mount and sectioned mouse embryos (E8.5-E10.5).
  • Whole-mount and light microscopic analysis of neural structures.
  • Validation using lipophilic dye tracing in older embryos (E11.5-E12.5).

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Main Results:

  • First neurons and axons detected at E8.5 in the neural plate, preceding neural tube closure.
  • Key tracts identified include the trigeminal nerve descending tract, tract of the postoptic commissure, and medial longitudinal fasciculus by E10.0.
  • Cajal-Retzius cells, the first neurons in the cerebral vesicle, appeared at E10.0; no tracts were formed in this region by E10.5.

Conclusions:

  • The study provides a detailed timeline of early neuronal and tract formation in the mouse embryonic brain.
  • Early-formed tracts are superficial, contrasting with deeper structures in the adult brain.
  • Findings offer a comparative basis for understanding vertebrate brain development across species.