File:Hertig1956 fig06.jpg

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Fig. 6.

Normal preimplantation stages in human development; one segmenting egg found in the tube, Streeter Horizon II, and two free intrauterine blastoeysts, Streeter Horizon III.


6 Mid-serial section of 107-cell blastocyst shown as intact. specimen in figure 5. There are 8 definite large vacuolated formative (embryonic) cells, 69 mural and 30 polar trophoblastic cells. Possibly -1 of the latter are actually formative endodermal cells. Note parts of 4 formative (embryonic) cells at right of picture. The. elongated cell to the upper left of the embryonic disc, interpreted originally as a polar trophoblast, may actually be one of the 4 potential endodermal cells. Note marked irregularity in form and some variation in size of mural trophoblastic cells. The polar trophoblastic cells encircle the. inner cell mass as a corona and vary in shape but tend to be polyhedral. Carnegie 8663, Section 9. X 500.



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Reference

Hertig AT. Rock J. and Adams EC. A description of 34 human ova within the first 17 days of development. (1956) Amer. J Anat., 98:435-493.


Cite this page: Hill, M.A. (2024, March 29) Embryology Hertig1956 fig06.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_fig06.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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