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Fig. 5. Surface aspect of blastoderm at various stages of cleavage

(Based on Blount's photomicrographs of the pigeon's egg.) The blastoderm and the immediately surrounding yolk are viewed directly from the animal pole, the shell and albumen having been removed.

The order in which vthe cleavage furrows have appeared is indicated on the diagrams by Roman numerals.

A, first cleavage; B, second cleavage

C, third cleavage; D, fourth cleavage

E, fifth cleavage; F, early morula.


Links: Introduction | Gametes and Fertilization | Segmentation | Entoderm | Primitive Streak and Mesoderm | Primitive Streak to Somites | 24 Hours | 24 to 33 Hours | 33 to 39 Hours | 40 to 50 Hours | Extra-embryonic Membranes | 50 to 55 Hours | Day 3 to 4 | References | All Figures
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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Reference

Patten BM. The Early Embryology of the Chick. (1920) Philadelphia: P. Blakiston's Son and Co.


Cite this page: Hill, M.A. (2019, April 20) Embryology Patten005.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Patten005.jpg

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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current15:59, 14 January 2011Thumbnail for version as of 15:59, 14 January 2011614 × 868 (137 KB)S8600021 (talk | contribs)==Fig. 5. Surface aspect of blastoderm at various stages of cleavage== (Based on Blount's photomicrographs of the pigeon's egg.) The blastoderm and the immediately surrounding yolk are viewed directly from the animal pole, the shell and albumen having be
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