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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...
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Assessing Signaling Properties of Ectodermal Epithelia During Craniofacial Development
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The avian prechordal head region: a morphological study

R Seifert1, M Jacob, H J Jacob

  • 1Department of Anatomy and Embryology, Ruhr-Universität Bochum, Germany.

Journal of Anatomy
|August 1, 1993
PubMed
Summary

Investigating chick and quail embryos, this study identifies the prechordal plate as a distinct endodermal structure contributing to head development. This finding clarifies the origins of embryonic head mesenchyme.

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Area of Science:

  • Developmental biology
  • Embryology
  • Cell biology

Background:

  • The axial mesoderm in the anterior head region is crucial for embryonic development.
  • Understanding the precise origins and contributions of different germ layers to head mesenchyme is essential.

Purpose of the Study:

  • To investigate the cellular composition and origins of the axial mesoderm in the anterior head region of chick and quail embryos.
  • To differentiate between the prechordal mesoderm and a newly identified endodermal structure, the prechordal plate.

Main Methods:

  • Light and electron microscopy were used to examine semithin sections of embryonic tissues.
  • Histological analysis focused on the cellular morphology and basal lamina presence.

Main Results:

  • The axial head mesoderm comprises the head process and prechordal mesoderm.
  • A distinct group of columnar epithelial cells, the prechordal plate, was identified at the anterior end of the prechordal mesoderm.
  • The prechordal plate, part of the endodermal germ layer, contributes to the formation of prosencephalic mesenchyme.

Conclusions:

  • The prechordal plate is a distinct endodermal structure, separate from the prechordal mesoderm.
  • The endodermal germ layer, via the prechordal plate, contributes to head mesenchyme formation, similar to the ectodermal neural crest.