File:Hertig1945d fig03.jpg: Difference between revisions

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==Plate 1. Ova of the eighth day==
==Fig. 3. A section of a. 7.5-day ovum==


'''Fig. 1.''' The middle cross section of an ovum not over 7.5 days of age. Above the somewhat eccentrically placed germ-disk is a barely discernible cleft—the amniotic cavity. Above the latter are a few dark, flattened amniogenic cells de-lamiznating in situ from the adjacent trophoblast. Toward the left of the chorionic cavity, a few primitive mesoblastic cells are seen which likewise arise from trophoblast by in situ delamination. Carnegie No. {{CE8225}}, section 20-5-5, X 300 (minus).
The same ovum as fig. 2 but 7 sections removed. The amniotic cavity is less evident because of its smaller size although the amniogenic cells overlying it are more prominent. Carnegie No. {{CE8020}}, section 6-5-2, X 300.
 
'''Fig. 2.''' The middle cross section of a 7.5-day ovum. The cleft-like amniotic cavity lies above the germ-disk and beneath amniogenic cells arising from the adjacent trophoblast. A single, flattened meso-blastic cell is seen to the right of the germ-disk and lying upon the inner aspect of the tropho-blast. Carnegie No. {{CE8020}}, section 6-5-9, X 300 (minus).
 
'''Fig. 3.''' The same ovum as fig. 2 but 7 sections removed. The amniotic cavity is less evident because of its smaller size although the amniogenic cells overlying it are more prominent. Carnegie No. {{CE8020}}, section 6-5-2, X 300.
 
'''Fig. 4.''' The same ovum as shown in figs. 2 and 3 but the section passes to one side of the germ-disk. Note at the embryonic pole the three prominent mesoblastic cells which are delaminating in situ from the adjacent troplgoblast. A somewhat more advanced stage of this process is seen in the two mesoblastic cells shown in fig. 5. Carnegie {{CE8020}}, section 6-3-6, X 300 (plus).
 
'''Fig. 5.''' A section of a. 7.5-day ovum (same specimen as figs. 2-4) showing a more advanced stage of mesoblastic formation. Note the two, nearly detached mesoblastic cells delaminating from, but still lightly attached to the trophoblast at the embryonic pole of the ovum. Carnegie {{CE8020}}, section 6-4-3, X 300 (plus).  


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[[Category:Carnegie Embryo 8020]][[Category:Carnegie Embryo 8225]]
[[Category:Carnegie Embryo 8020]]

Latest revision as of 15:22, 24 October 2017

Fig. 3. A section of a. 7.5-day ovum

The same ovum as fig. 2 but 7 sections removed. The amniotic cavity is less evident because of its smaller size although the amniogenic cells overlying it are more prominent. Carnegie No. 8020, section 6-5-2, X 300.

  • Fig 1 Carnegie No. 8225

    Fig 1 Carnegie No. 8225

  • Fig 2 Carnegie No. 8020

    Fig 2 Carnegie No. 8020

  • Fig 3 Carnegie No. 8020

    Fig 3 Carnegie No. 8020

  • Fig 4 Carnegie No. 8020

    Fig 4 Carnegie No. 8020

  • Fig 5 Carnegie No. 8020

    Fig 5 Carnegie No. 8020

Reference

Hertig AT. On the development of the amnion and exocoelomic membrane in the previllous human ovum. (1945) Yale J Biol Med. 18:107-15. PubMed 21007544

Cite this page: Hill, M.A. (2024, April 26) Embryology Hertig1945d fig03.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1945d_fig03.jpg

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