File:Hertig1956 fig28-29.jpg

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Fig. 28-29.

Three normal, late previllous ova 11 to 12 days old, of Horizon Vc. characterized by intereommunieating laeunar spaces filled with maternal plasma containing still increasing numbers of blood cells, a distended chorionic. cavity, an execoelomic cavity of maximum size, a bilaminar germ disc and well~defined amnion and amniotic cavity. Details of the germ discs of these ova are shown on plate 6.


28 A surface view of an intact 12-day ovum after fixation, dehydration and clearing to show the appearance of maternal blood in the lacunar spaces. This is the most distinctive gross feature of, and first. appears at, this stage of develop ment. It is due to flooding of the trophoblastic. lacunae with maternal blood. Carnegie 7700, Sequence 9. X 22.

29 A medilun-power view of a. mid-cross section of the ovum shown in figure 28. Early decidua is developing in the area iimnediately surrounding the ovum. Note three irregular masses of cytotrophohlast-—primordial villi—projccting into the syncytium. Note fully developed cxocoelomic cavity and membrane with a loose. mesh-work of mesohlasts between it and the cytotroplioblast lining the «ho:-ionic cavity. The trophoblast at the abembryonic pole is poorly differentiated, as contrasted to that at the embryonic or implantation pole. Carnegie 7700, Section 6-1-5. X100.


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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 24) Embryology Hertig1956 fig28-29.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_fig28-29.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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