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Plate 5

Two normal 12-day ova also in Horizon Vc, characterized by intereommunicating lacunar spaces with evidence of early utero-placental circulation, a distended chorionic cavity, an exocoelomie cavity of maximum size, a bilaminar germ disc and a well-defined amnion and amniotic cavity. Details of their germ discs are shown on plate 6.

30 A medium-power view of a mid-cross section of the ovum shown in ﬁgure 31. A coagulum is lying over the uuhealed penetration defect as evidence of seepage of maternal blood and plasma from laennar space into the uterine lumen. Note the persistent edema of the endometrium and the early decidua developing immediately around the ovum. Note primordial villi and also the gland on the left which has been surrounded by syncytimn. A dilated blood vessel is seen at the margin of the ovum at the right. Carnegie 8558, Section 10-1-4. X 100.

31 A surface view of an intact 12-day implantation site to show the endonietrial detect, the source of maternal bleeding into the uterine lumen at. this and slightly later stages. Note the small tabs of coagalum in the ulcer. A hemorrhage, which became detached and hence is not shown, arose from this defect. Carnegie 8558, Sequence 5. X22.

32 A medium-power View of a mid-cross section of the ovum shown in ﬁgure 33. Note the early deeidual reaction about the ovum, the primordiuni of a villus on the left, the few blood cells within the lacnnar spaces and the large exocoelomic cavity. Carnegie 8330, Section 9-2-6. X 100.

33 A proﬁle View of a. 12-day ovum to show its elevation from the surrounding endometrium. Carnegie 8330, Sequence 3. X 12.

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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, June 16) Embryology Hertig1956 plate05.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_plate05.jpg

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Paper - A description of 34 human ova within the first 17 days of development

@@ Line 10: / Line 10: @@
 A proﬁle View of a. 12-day ovum to show its elevation from the surrounding endometrium. [[:Category:Carnegie Embryo 8330|Carnegie 8330]], Sequence 3. X 12.
----Plate 6===
-High-power views of the germ discs of the ﬁve 11- to 12-day ova of Horizon Vc illustrated previously on plates 4 and 5.
-[[File:Hertig1956 plate06.jpg|600px]]
-The germ disc and anmion of an 11-day ovum. Note the orderly arrangement of cylindrical vacuolated ectodermal cells, beneath which is the irregularly arranged layer of vacuolated and foam_\'-appearing polyhedral cells of the endoderm. Dorsal to the germ disc is the amnion, delaminated in situ from the overlying cytotrophoblast and attached to the peripheral margin of the ectoderm. Note a. few mesoblasts also of cytotrophoblastic origin external to the amnion and merging with those at the junction of the endodermal plate and the exocoelomic membrane. [[:Category:Carnegie Embryo 7699|Carnegie 7699]], Section 8-5-3. X 300.
-The germ disc and amnion of a 12-day ovum. Occasional irregularly distributed vacuoles are seen in the ectoderm. Note the thin layer of polyhedral cells of the endodcrmal plate which joins laterally with the elongated mesohlasts of the exocoelomie membrane. Note the ﬁat amniotic cavity with amniogenesis from the overlying cytotrophoblasts. [[:Category:Carnegie Embryo 7950|Carnegie 7950]], Section 11-5-2. X 300.
-The germ disc and amnion of a 12-day ovum. Note the mitotic ﬁgure of the amniotic cell delaminating from the cytotrophoblast. Note also the ventral orientation of the vacuoles in the eetoderm and the less evident dorsal orientation of similar structures in the endoderm. [[:Category:Carnegie Embryo 7700|Carnegie 7700]], Section 5-7-7. X 300.
-The germ disc. of a 12-day ovum. Note that in this specimen the vacuolated ectodermal cells appear to be located peripherally. [[:Category:Carnegie Embryo 8558|Carnegie 8558]], Section 10-1-4. X 300.
-The germ disc of a 12-day ovum. Note that vacuolated ectodermal cells appear to be concentrated toward the left and that the cxtraembryonic. mesoblast is more condensed in this area perhaps indicating the beginning of axis formation in this embryo, the oldest in our Horizon Vc. [[:Category:Carnegie Embryo 8330|Carnegie 8330]], Section 9-2-5. X 300.
 {{Hertig1956 figures}}