File:Hertig1956 plate14.jpg

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Plate 14

Two abnormal previllous ova, of about 12 to 13 days of age, with hypoplastic trophoblast and moderate to extreme dilatation of the lacunar spaces. These ova are probably older than their apparent trophoblastic development as suggested by the advanced decidual reaction and hemorrhage into a gland, features usually associated with normal early villous ova (figs. 39-47).

74 A medium-power view of the section through the greatest diameter of the younger of these abnormal previllous ova showing thin trabeculae of syncytium with dilated lacunae and a relative lack of extraembryonic mesoblast within the ehorionic cavity. Note formation of primordial villus, amniogenesis aml normal appearing germ disc with distended exocoelom. It is doubtful how much longer this deficient placenta would have maintained the integrity of corpus luteum function. It would appear that early abortion might well follow the resulting hormonal deficiency. In any event spontaneous abortion is caused by or associated with variable degrees of placental hypoplasia. Carnegie 7770, Section 12-3-5. X 100.

75 Surface view of the implantation site of the abnormal ovum shown in figure 74 to show its grossly normal appearance. Note rounded contour and ulcer ation of implantation site with surrounding normal endometrium. Carnegie 7770, Sequence 5. X 22.

76 Surface view of the normal appearing implantation site of the abnormal ovum shown in figure 77. Carnegie 7850, Sequence 4. X 20.

77 A medium-power view of the section through the greatest diameter of an abnormal previllous ovum to show the extreme dilatation of the trophoblastie lacunae. Note the marked hypoplasia of the syncytiotrophoblast which is reduced to fine irregular strands and the relative paucity of cytotrophoblast and the primordial villi resulting therefrom. Note well-formed amnion but relatively small germ disc. The development of the yolk-sac cavity beneath the latter is inconsistent with that of the trophoblast. The primary defect probably lies in the trophoblast with corresponding deficiencies in the structures derived therefrom. Note also the significant deeidual reaction with pronounced leucoeytic infiltration. Inevitable early abortion can be predicted for such a specimen on the basis of its lack of ability to maintain function of the corpus luteum. Such an abortion might take the form of a profuse flow not much later than the next expected period and thus give no undisputed evidence of its true nature. Carnegie 7850, Section 14-3-4. X 100.


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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 plate14.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_plate14.jpg

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