The formation of the allantoic placenta in the golden hamster (Mesocricetus auratus)

  • H. Butler


The processes of attachment, implantation and placentation in the golden hamster (Mesocricetus auratus) have been re-examined. Blastocyst attachment occurs at 4.0 days P.C. and complete interstitial implantation is attained by 5.5 days P.C. At 6.15 days P.C. the trophoblast of the träger breaks into the uterine lumen which becomes filled with blood clot. The advancing träger uses this blood clot as a bridge to reach the decidua basalis, lying on the opposite side of the uterine cavity, at 8.5 days P.C. Thus the uterine lumen becomes obliterated opposite each conceptus by the formation of the allantoic placentas which are vascularised by 8.5 days P.C. Non-glandular extensions of the glandular interlocular lumina penetrate between the decidua capsularis and the muscularis of the antimesometrial wall of the uterus from the 8th day P.C. onwards. On the 14th day P.C. the parietal wall of the yolk sac and its thin covering layer of decidua capsularis disappear to form a completely inverted yolk sac placenta. This places the yolk sac cavity in continuity with the non-glandular extensions of the uterine lumen and re-establishes complete continuity of the uterine lumen.


Allantoic placenta Blastocyst Implantation Mesocricetus auratus Yolk sac placenta 


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  1. Adams, F. W., Hilleman, H. H.: Morphogenesis of the vitelline and allantoic placenta of the golden hamster (Cricetus auratus). Anat. Rec. 108, 363–383 (1950).Google Scholar
  2. Amoroso, B. C.: Placentation in Marshall's Physiology of Reproduction, edit. A. S. Parkes, p. 127–311. London: Longmans, Green & Co. 1952.Google Scholar
  3. Foote, C. L., Norman, W. P., Foote, F. M.: Formation of the extra-embryonic cavities of the hamster. Amer. J. Anat. 95, 291–307 (1954).Google Scholar
  4. Graves, A. P.: Development of the golden hamster, Cricetus auratus Waterhouse, during the first nine days. Amer. J. Anat. 77, 219–251 (1945).Google Scholar
  5. Hamilton, J. W., Samuel, D. M.: The early development of the golden hamster (Cricetus auratus). J. Anat. (Lond.) 90, 395–416 (1956).Google Scholar
  6. Mossman, H. W.: Comparative morphogenesis of the fetal membranes. Carnegie Contrib. Embryol. 26, 129–246 (1937).Google Scholar
  7. Venable, J. H.: Pre-implantation stages in the golden hamster. Anat. Rec. 94, 105–120 (1946).Google Scholar
  8. Ward, M. D.: The early development and implantation of the golden hamster, Cricetus auratus, and associated endometrial changes. Amer. J. Anat. 82, 231–275 (1948).Google Scholar
  9. Ward-Orsini, M. D.: The trophoblastic giant cells and endovascular cells associated with pregnancy in the hamster, Cricetus auratus. Amer. J. Anat. 94, 273–331 (1954).Google Scholar

Copyright information

© Springer-Verlag 1970

Authors and Affiliations

  • H. Butler
    • 1
  1. 1.Department of AnatomyUniversity of SaskatchewanSaskatoonCanada

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