PMID: 558124Jan 1, 1977Paper

Scanning electron microscopy (SEM) of the chick embryo primitive streak

Differentiation; Research in Biological Diversity
J Wakely, M A England

Abstract

The structure of the cells forming the primitive streak was examined by SEM in a series of embryos at Hamburger and Hamilton's stages 2--5. Specimens were prepared by stripping the endoderm from fresh embryos in New Culture and by fracturing whole fixed embryos along and at right angles to the primitive streak. At all stages of examination the SEM appearance of cells within the privitive streak was quite different from that of ectodermal, endodermal or mesodermal cells away from the streak. Streak cells were closely packed, lay with their long axes directed from ectoderm to endoderm and possessed many flat leaf-like processes. By contrast the ectoderm formed a columnar epithelium, the endoderm a flat epithelium and the mesoderm was a layer of loosely arrangedcells with long. thin processes. Within the streak SEM did not show any differences between cells that could identify them specifically as future endoderm or mesoderm cells. It was concluded that during gastrulation all the cells migrating through the primitive streak have the same appearance regardless of their eventual destination in the embryo. This structure may be attributable to the type of movement made by cells during invagination.

References

Jun 1, 1976·Developmental Biology·M Solursh
May 1, 1976·Experimental Cell Research·C A Erickson, J P Trinkaus
Jan 1, 1974·Anatomy and Embryology·P Mestres, K Hinrichsen
Aug 1, 1971·Experimental Cell Research·M AbercrombieS M Pegrum
Jun 1, 1970·Experimental Cell Research·M AbercrombieS M Pegrum
Dec 1, 1970·Developmental Biology·N H Granholm, J R Baker
Jul 1, 1967·Developmental Biology·R L TrelstadJ D Revel

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Citations

Jul 17, 1978·Anatomy and Embryology·M A England, J Wakely
Dec 28, 1977·Anatomy and Embryology·M A England, S V Cowper
Jun 2, 1978·Anatomy and Embryology·J Wakely, M A England
Jun 1, 1992·Anatomia, histologia, embryologia·J GilM Gimeno
Jun 27, 2018·Wiley Interdisciplinary Reviews. Developmental Biology·Yunyun Huang, Rudolf Winklbauer
Jan 1, 1986·Roux's Archives of Developmental Biology : the Official Organ of the EDBO·Nikolas Zagris, Demetrios Matthopoulos
Apr 11, 2021·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·Sharada IyerMegha Kumar

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