DOI: 10.1002/jez.1401580103. Germ layer formation and the role of the primitive streak in the chick. I. Basic architecture and morphogenetic tissue movements

Germ layer formation and the role of the primitive streak in the chick. I. Basic architecture and morphogenetic tissue movements

10.1002/jez.1401580103

Crossref journal-article

Wiley

Journal of Experimental Zoology (311)

Abstract

AbstractHistological studies, carbon, carmine and vital dye marking of in ovo and explanted blastoderms have provided evidence for the following: (1) The cellular precursors of all three primary germ layers in the unincubated blastoderm are topographically represented by a disc‐shaped, epithelial‐like and complete uppermost layer; and ring‐shaped, incomplete and congruent middle and lowest layers below the uppermost layer. (2) There is a gradient in cell population density decreasing from posterior to anterior. (3) Centripetal extension of a sheet of lowest and adjacent middle layer cells, primarily from the posterior portion of the ring but also from all points on its circumference, results in closing of the ring and completion of the middle and lowest layers as coherent discs. (4) No movement (invagination or involution) of uppermost, surface areas as coherent sheets into either the middle or lowest layers could be demonstrated in any region, including the primitive streak. (5) Embryonic germ layers arise in situ by proliferation from the streak. (6) The streak in its morphology and function is more like a blastema than a blastopore. (7) As an elongated growth center, the streak has its origin from the marginal zone ring, itself a circular blastema with multiple streak‐ and embryo body‐forming capacities.

Bibliography

Spratt, N. T., & Haas, H. (1965). Germ layer formation and the role of the primitive streak in the chick. I. Basic architecture and morphogenetic tissue movements. Journal of Experimental Zoology, 158(1), 9â38. Portico.

Authors 2

Nelson T. Spratt (first)
Hermann Haas (additional)

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Dates

Type	When
Created	20 years, 2 months ago (June 11, 2005, 6:37 a.m.)
Deposited	1 year, 9 months ago (Nov. 12, 2023, 10:20 a.m.)
Indexed	4 months, 2 weeks ago (April 9, 2025, 11:07 a.m.)
Issued	60 years, 6 months ago (Feb. 1, 1965)
Published	60 years, 6 months ago (Feb. 1, 1965)
Published Online	20 years, 3 months ago (May 12, 2005)
Published Print	60 years, 6 months ago (Feb. 1, 1965)

Funders 0

None

BibTeX

@article{Spratt_1965, title={Germ layer formation and the role of the primitive streak in the chick. I. Basic architecture and morphogenetic tissue movements}, volume={158}, ISSN={1097-010X}, url={http://dx.doi.org/10.1002/jez.1401580103}, DOI={10.1002/jez.1401580103}, number={1}, journal={Journal of Experimental Zoology}, publisher={Wiley}, author={Spratt, Nelson T. and Haas, Hermann}, year={1965}, month=feb, pages={9–38} }

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