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Development of the chick embryo endoderm studied by S.E.M



Development of the chick embryo endoderm studied by S.E.M



Anatomy and Embryology 153(2): 167-178



The endoderm of a series of chick embryos from the unincubated egg to stage 5 was examined by scanning electron microscopy (SEM). During this period the endoderm develops from a few scattered cells to a complete epithelial layer. Prior to the formation of the primitive streak endoderm cells can be observed delaminating from the ectoderm. These cells are round and have few processes except where they contact each other. At stage 2 cells appear in the endoderm over the primitive streak wich have broad flat processes. The cells originate directly from the streak. Away from the streak the endoderm cells are either smooth or have short microvilli. In later streak stages a mixture of smooth and some microvillous cells form a hexagonal pattern. This pattern is occasionally modified and holes are found in the endoderm with cell processes protruding from below the endoderm level. Sometimes whole cells, smaller and rounder than the majority of the endoderm cells are associated with this disturbance of the pattern. These cells are connected to the mesoderm by a long cytoplasmic process. They could be cells entering the endoderm from the middle layer, having accompanied the mesoderm cells through the primitive streak.

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Accession: 068533405

Download citation: RISBibTeXText

PMID: 677469

DOI: 10.1007/bf00343372


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