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Fig. 4.

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


4 Mid-serial section of 58-cell intrauterine blastocyst shown as intact specimen in figure 3. Note absence of zona, about two-thirds of the periphery, probably of artifactitious origin. The two polar bodies are evident at opposite poles of the ovum. The inner cell mass of 5 blastomeres, only 4 of which are present in this section, is lying eccentrically within the segmentation cavity and surrounded by primitive troplioblastic blastomcres. The primitive segmentation cavity, composed of several coalescing spaces, is most clearly delineated as a single unit in this and the two contiguous sections. Note that the nuclei of the embryonic blastomeres, although of equal size, are less vesicular and contain denser clumps of chromatin than those of the trophoblastic blastomeres. Carnegie 8794, Section 7. 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, May 29) Embryology Hertig1956 fig04.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_fig04.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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