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Related Concept Videos

Neurulation01:30

Neurulation

Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the anterior...
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Related Experiment Video

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Assessing Signaling Properties of Ectodermal Epithelia During Craniofacial Development
09:25

Assessing Signaling Properties of Ectodermal Epithelia During Craniofacial Development

Published on: March 24, 2011

Molecular and tissue interactions governing induction of cranial ectodermal placodes.

Kathryn L McCabe1, Marianne Bronner-Fraser

  • 1Division of Biology 139-74, California Institute of Technology, Pasadena, CA 91125, USA.

Developmental Biology
|June 9, 2009
PubMed
Summary

Cranial ectodermal placodes contribute to head peripheral nervous system development. Molecular signals like FGFs and Wnts guide placodal cell induction and neurogenesis, particularly for trigeminal and epibranchial ganglia.

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Area of Science:

  • Developmental Biology
  • Neuroscience
  • Molecular Biology

Background:

  • Neural crest cells form the trunk peripheral nervous system.
  • Cranial ectodermal placodes and neural crest form the head peripheral nervous system.
  • Placodes contribute to cranial ganglia and sensory structures.

Purpose of the Study:

  • To review recent advances in understanding placodal induction and neurogenesis.
  • To highlight tissue interactions and molecular signals involved.
  • To focus on trigeminal and epibranchial placodes.

Main Methods:

  • Review of recent scientific literature.
  • Analysis of molecular signaling pathways.
  • Emphasis on tissue interactions in placode development.

Main Results:

  • Identified key molecular signals mediating placodal induction and differentiation.
  • Discussed the roles of Fibroblast Growth Factors (FGFs), Platelet Derived Growth Factors (PDGFs), Sonic Hedgehog (SHH), TGFbeta superfamily, and Wnts.
  • Highlighted the importance of these signals in neurogenesis of cranial placodes.

Conclusions:

  • Molecular signals and tissue interactions are crucial for cranial placode development.
  • FGFs, PDGFs, SHH, TGFbeta, and Wnts play significant roles in placodal neurogenesis.
  • Understanding these pathways advances knowledge of peripheral nervous system formation in the head.