Document Detail


Shaping and bending of the avian neural plate as analysed with a fluorescent-histochemical marker.
MedLine Citation:
PMID:  2806115     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Shaping and bending of the neural plate are cardinal events of neurulation. These processes are initiated in avian embryos shortly after the onset of gastrulation and concluded concomitantly with the completion of gastrulation. The epiblast undergoes extensive morphogenetic movements during gastrulation and neurulation, but the directions, distances, rates, mechanisms and roles of such rearrangements are largely unknown. To begin to understand these morphogenetic movements, we have mapped regional displacements of the epiblast by injecting a fluorescent-histochemical marker into selected prenodal, nodal and postnodal levels of the blastoderm. Lateral epiblast regions (600 microns lateral to the midline and consisting primarily of surface epithelium) are displaced craniomedially, medial regions (300 microns lateral to the midline and consisting of neural plate and preingressed mesoderm) predominantly medially, and midline regions (consisting of neural plate and primitive streak) predominantly caudally. Displacements within the avian neural plate parallel those previously described for the amphibian neural plate. Furthermore, similar tissue displacements occur within the prenodal and postnodal levels of the avian epiblast despite the fact that neurulation is occurring in the former and gastrulation in the latter. Finally, our results show that ectodermal rudiments contained within a single cross-sectional level of the embryo are a composite of cells derived from multiple craniocaudal and mediolateral levels. Thus, regional tissue displacements are important events to consider in the analysis of the early morphogenesis of axial and paraxial organ rudiments derived from the epiblast.
Authors:
G C Schoenwolf; P Sheard
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Development (Cambridge, England)     Volume:  105     ISSN:  0950-1991     ISO Abbreviation:  Development     Publication Date:  1989 Jan 
Date Detail:
Created Date:  1989-12-06     Completed Date:  1989-12-06     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8701744     Medline TA:  Development     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  17-25     Citation Subset:  IM    
Affiliation:
Department of Anatomy, University of Utah, School of Medicine, Salt Lake City 84132.
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MeSH Terms
Descriptor/Qualifier:
Animals
Cell Movement
Central Nervous System / embryology*
Chick Embryo
Gastrula / physiology*
Microscopy, Electron
Microscopy, Fluorescence
Video Recording
Grant Support
ID/Acronym/Agency:
NS 18112/NS/NINDS NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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